Keep thy father's commandment - See on Proverbs 1:8 (note).

My son, keep thy father's commandment,.... These are not the words of David to Solomon continued from Proverbs 4:4; but the words of Solomon to his son; and not to his son only, in a strict natural relation, but to everyone that came to him for and put himself under his instruction; and to everyone that stood in such a relation to a religious father; for not the divine Being, the Father of all, is here meant, according to some Jewish writers; though the commandment no doubt is the commandment of God taught by godly parents; or such a system of precepts that is founded upon and agrees unto the revealed will of God, and which being so should be laid up and kept in the heart, and not forgotten; and should be observed and attended to and obeyed throughout the whole course of life, as if it was the commandment of God himself; and indeed it is no other than that which pious parents train up their children in the knowledge of, instil into them, and urge upon them the observance of;
and forsake not the law of thy mother; the same as before, and which is mentioned to show that the same respect is to be had to a mother as to a father, the commandment and law of them being the same, and they standing in the same relation; which yet children are apt to make a difference in, and while they stand in awe of their father and his precepts, slight their mother and her directions, which ought not to be. Some understand this of the congregation of Israel, as some Jewish writers; and others of the church of God, the mother of us all.

The word of God has something to say to us upon all occasions. Let not faithful reproofs ever make us uneasy. When we consider how much this sin abounds, how heinous adultery is in its own nature, of what evil consequence it is, and how certainly it destroys the spiritual life in the soul, we shall not wonder that the cautions against it are so often repeated. Let us notice the subjects of this chapter. Let us remember Him who willingly became our Surety, when we were strangers and enemies. And shall Christians, who have such prospects, motives, and examples, be slothful and careless? Shall we neglect what is pleasing to God, and what he will graciously reward? May we closely watch every sense by which poison can enter our minds or affections.

(Compare Proverbs 1:8; Proverbs 3:3, &c.).

After these three smaller sections, the teacher of wisdom returns here to the theme of the eighth: Warning against sins of the flesh, whose power and prevalence among men is so immeasurably great, that their terrible consequences cannot sufficiently be held up before them, particularly before youth.
20 Keep, my son, the commandment of thy father,
And reject not the instruction of thy mother.
21 Bind them to thy heart evermore,
Fasten them about thy neck.
The suff. -ēm refers to the good doctrine (cf. Proverbs 7:3) pointed out by מצוה and תּורה; the masc. stands, as is usual (e.g., Proverbs 1:16; Proverbs 5:2), instead of the fem. Regarding the figure, reminding us of the Tefillin and of Amuletes for perpetual representation, vid., under Proverbs 3:3. Similarly of persons, Song 8:6. The verb ענד (only here and Job 31:36) signifies to bend, particularly to bend aside (Arab. 'ind, bending off, going aside; accus. as adv., aside, apud), and to bend up, to wind about, circumplicare.

The law - The word of God, which thy parents delivered to thee.