21 Solomon ruled over all the kingdoms from the Euphrates River in the north to the land of the Philistines and the border of Egypt in the south. The conquered peoples of those lands sent tribute money to Solomon and continued to serve him throughout his lifetime.
Matthew Henry's Commentary on 1 Kings 4:21
Commentary on 1 Kings 4:20-28
(Read 1 Kings 4:20-28)
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.