Juda and Israel were innumerable, as the sand of the sea in multitude: eating and drinking, and rejoicing.

Judah and Israel are many, as the sand that is by the sea for multitude, eating and drinking and rejoicing.

Judah and Israel were as great in number as the sand by the seaside, and they took their food and drink with joy in their hearts.

Judah and Israel were innumerable, like the sand of the sea in multitude: eating and drinking, and rejoicing.

There is some doubt about the proper arrangement of the remainder of this chapter. The best alteration, if we alter the Hebrew order at all, would be to place 1-Kings 4:20-21 after 1-Kings 4:25.
Many - See 1-Kings 3:8 note; and compare Psalm 127:1-5, which is traditionally ascribed to Solomon, and which celebrates the populousness and security of Israel in his day.

Eating and drinking, and making merry - They were very comfortable, very rich, very merry, and very corrupt. And this full feeding and dissipation led to a total corruption of manners.

Judah and Israel [were] many, as the sand which [is] by the sea in multitude, (f) eating and drinking, and making merry.
(f) They lived in all peace and security.

Judah and Israel were many, as the sand which is by the sea in multitude,.... Being blessed with great fruitfulness in their families, and having no pestilential disease among them, nor wars to lessen their number, and so the promise to Abraham was fulfilled, Genesis 22:17; and which was an emblem of Christ's spiritual subjects, especially in the latter day, whom Solomon was a type of, see Hosea 1:10;
eating, and drinking, and making merry; having a large increase of the fruits of the earth, and in no fear of any enemies; expressive of the spiritual joy of believers in the kingdom of Christ, and under the word and ordinances, Song 2:3.

Never did the crown of Israel shine so bright, as when Solomon wore it. He had peace on all sides. Herein, his kingdom was a type of the Messiah's; for to Him it is promised that he shall have the heathen for his inheritance, and that princes shall worship him. The spiritual peace, and joy, and holy security, of all the faithful subjects of the Lord Jesus, were typified by that of Israel. The kingdom of God is not, as Solomon's was, meat and drink, but, what is infinitely better, righteousness, and peace, and joy in the Holy Ghost. The vast number of his attendants, and the great resort to him, are shown by the provision daily made. Herein Christ far outdoes Solomon, that he feeds all his subjects, not with the bread that perishes, but with that which endures to eternal life.

In 1-Kings 4:20 the account of Solomon's officers is closed by a general remark as to the prosperous condition of the whole nation; though we miss the copula Vav at the commencement. The words, "Judah and Israel were numerous as the sand by the sea," indicate that the promise given to the patriarchs (Genesis 22:17, cf. Genesis 32:13) had been fulfilled. To this there is appended in 1-Kings 5:1 the remark concerning the extent of Solomon's sway, which prepares the way for what follows, and shows how the other portion of the promise, "thy seed will possess the gates of its enemies," had been fulfilled. - The first fourteen verses of 1 Kings 5 are therefore connected by the lxx, Vulg., Luther, and others with 1 Kings 4. It is not till 1-Kings 5:15 that a new section begins.