The Lord is the portion of mine inheritance. Here the Psalmist explains his sentiments more clearly. He shows the reason why he separates himself from idolaters, and resolves to continue in the church of God, why he shuns, with abhorrence, all participation in their errors, and cleaves to the pure worship of God; namely, because he rests in the only true God as his portion. The unhappy restlessness of those blind idolaters whom we see going astray, and running about as if stricken and impelled by madness, is doubtless to be traced to their destitution of the true knowledge of God. All who have not their foundation and trust in God must necessarily be often in a state of irresolution and uncertainty; and those who do not hold the true faith in such a manner as to be guided and governed by it, must be often carried away by the overflowing floods of errors which prevail in the world. This passage teaches us, that none are taught aright in true godliness but those who reckon God alone sufficient for their happiness. David, by calling God the portion of his lot, and his inheritance, and his cup, protests that he is so fully satisfied with him alone, as neither to covet any thing besides him, nor to be excited by any depraved desires. Let us therefore learn, when God offers himself to us, to embrace him with the whole heart, and to seek in him only all the ingredients and the fullness of our happiness. All the superstitions which have ever prevailed in the world have undoubtedly proceeded from this source, that superstitious men have not been contented with possessing God alone. But we do not actually possess him unless "he is the portion of our inheritance;" in other words, unless we are wholly devoted to him, so as no longer to have any desire unfaithfully to depart from him. For this reason, God, when he upbraids the Jews who had wandered from him as apostates, with having run about after idols, addresses them thus, "Let them be thine inheritance, and thy portion." By these words he shows, that if we do not reckon him alone an all-sufficient portion for us, and if we will have idols along with him, he gives place entirely to them, and lets them have the full possession of our hearts. David here employs three metaphors; he first compares God to an inheritance; secondly, to a cup; and, thirdly, he represents him as He who defends and keeps him in possession of his inheritance. By the first metaphor he alludes to the heritages of the land of Canaan, which we know were divided among the Jews by divine appointment, and the law commanded every one to be content with the portion which had fallen to him. By the word cup is denoted either the revenue of his own proper inheritance, or by synecdoche, ordinary food by which life is sustained, seeing drink is a part of our nourishment. It is as if David had said, God is mine both in respect of property and enjoyment. Nor is the third comparison superfluous. It often happens that rightful owners are put out of their possession because no one defends them. But while God has given himself to us for an inheritance, he has engaged to exercise his power in maintaining us in the safe enjoyment of a good so inconceivably great. It would be of little advantage to us to have once obtained him as ours, if he did not secure our possession of him against the assaults which Satan daily makes upon us. Some explain the third clause as if it had been said, Thou art my ground in which my portion is situated; but this sense appears to me to be cold and unsatisfactory.

The Lord is the portion of mine inheritance - In contradistinction from idols. The margin here is, "of my part." The word properly means "lot, portion, part;" and is applicable to the portion of booty or plunder that fell to anyone; or to the portion of land that belonged to anyone in the division of an estate, 2-Kings 9:10, 2-Kings 9:36-37. The meaning here is, that Yahweh was the being whom the psalmist worshipped as God, and that he sought no possession or comfort which did not proceed from him.
And my cup - The allusion here is to what we drink; and hence, the term is used in the sense of "lot" or "portion." See the notes at Isaiah 51:17. Compare the notes at Psalm 11:6. The idea here is this: "The cup that I drink - that cheers, refreshes, and sustains me - is the Lord. I find comfort, refreshment, happiness, in him alone; not in the intoxicating bowl; not in sensual joys; but in God - in his being, perfections, friendship."
Thou maintainest my lot - Thou dost defend my portion, or that which is allotted to me. The reference is to what he specifies in the following verse as his inheritance, and he says that that which was so valuable to him was sustained or preserved by God. He was the portion of his soul; he was the source of all his joy; he maintained or preserved all that was dear to his heart.

The Lord is the portion of mine inheritance - The Messiah speaks. Jehovah is the portion of mine inheritance; I seek no earthly good; I desire to do the will of God, and that only. It is God who has given me this lot - to redeem mankind - to have them for mine inheritance. From him I have received the cup of suffering, which I shall drink for their sake, through which I shall impart to them the cup of consolation. He, by the grace of God, has tasted death for every man; and he has instituted the cup of blessing to commemorate his passion and death.

The Lord is the portion of mine inheritance and of my cup,.... This is said by Christ as a priest, and in allusion to the Levitical priests, who had no inheritance in the land of Canaan with their brethren, but the Lord was their part and portion, and their inheritance, Numbers 18:20; and it expresses the strong love and affection Christ had for the Lord as his God, the delight and pleasure he had in him, and the satisfaction he had in the enjoyment of him and communion with him, and that it was his meat and drink to serve him, and to do his will; and though his goodness did not extend to him, yet his goodness and happiness as man lay in him: unless the sense should be,
"the Lord is he who gives me the portion of mine inheritance;''
meaning his church and people, all the elect of God, who are Christ's portion and inheritance, given him by the Father; see Deuteronomy 32:9; And assigns to me my cup, as of blessings, so of sorrows and sufferings, which being measured out, filled up, and put into his hand by his Father, he freely took it, John 18:11;
thou maintainest my lot; that is, either his interest in God himself, as his covenant God, which always continued; or the lot of goods, of grace and glory, put into his hands for his people, which always remains; or rather the saints themselves, who, as they are Christ's portion and inheritance, so they are his lot; in allusion to the land of Canaan, which was divided by lot: these Jehovah took hold of, kept, preserved, and upheld, as the word (s) signifies; so that they shall never totally and finally fall and perish; and this sense is countenanced by what follows.
(s) "sustentas", Musculus, Pagninus, Junius & Tremellius, Piscator; so Ainsworth; "sustentans", Montanus, Michaelis; "tenuisti", Cocceius; "tenendo quasi sustentans", Gejerus.

God is the chief good, and supplies all need (Deuteronomy 10:9).
portion of mine inheritance and of my cup--may contain an allusion to the daily supply of food, and also to the inheritance of Levi (Deuteronomy 18:1-2).
maintainest--or, drawest out my lot--enlargest it. Psalm 16:7 carries out this idea more fully.

The Lord - I rejoice in God as my portion, and desire no better, no other felicity. Cup - The portion which is put into my cup, as the ancient manner was in feasts, where each had his portion of meat, and of wine allotted to him. Lot - My inheritance divided to me by lot, as the custom then was.