Solomon
Proverbs 3:3ESV·traditional attribution

Let not steadfast love and faithfulness forsake you; bind them around your neck; write them on the tablet of your heart.

Matthew Henry Presbyterian @wholebiblehenry

We are here taught to live a life of communion with God; and without controversy great is this mystery of godliness, and of great consequence to us, and, as is here shown, will be of unspeakable advantage. I. We must have a continual regard to God's precepts, Pro 3:1, Pro 3:2. 1.

Commenting on Proverbs 3:1-6

John Gill Reformed Baptist @doctorgill

Let not mercy and truth forsake thee,.... Or, forsake not them, and the exercise of them; show "mercy" to fellow creatures, to sinful men, to the bodies of men, by relieving their wants; and to their souls, by pitying and praying for them, and by giving them wholesome counsel and advice: to fellow Christians, sympathize with them in their troubles, put on bowels of compassion...

Jamieson-Fausset-Brown Reformed @jfbcommentary

mercy and truth--God's faithfulness to His promises is often expressed by these terms (Psa 25:10; Psa 57:3). As attributes of men, they express integrity in a wide sense (Pro 16:6; Pro 20:28). bind . . . write . . . heart--outwardly adorn and inwardly govern motives.