Proverbs 27:17 uses iron sharpening iron to describe mutual sharpening through interaction, paralleling how a friend's counsel sharpens and gladdens.

Proverbs 15:23 celebrates timely words bringing joy—directly paralleling the sweet counsel of a friend in Proverbs 27:9.

In Proverbs 16:24, gracious words are like honey — same metaphor of sweetness from wise speech, reinforcing the value of pleasant counsel.

Proverbs 12:25 says a good word makes the heart glad, directly paralleling the sweetness of a friend's counsel that gladdens the heart.

Proverbs 16:21 speaks of 'sweetness of lips' increasing learning—echoing the sweetness of hearty counsel.

In 1 Samuel 23:16, Jonathan strengthens David's hand — a direct example of a friend's earnest counsel bringing encouragement.

In 1 Samuel 23:17, Jonathan reassures David of God's plan — another instance of a friend's faithful counsel, sweetening David's heart.

In Psalm 45:7, 'oil of gladness' directly matches the gladdening oil in Proverbs 27:9, linking joy to anointing.

In Exodus 18:17-24, Jethro gives Moses practical counsel — a narrative example of the wisdom from a friend's advice that Proverbs celebrates.

Psalm 133:2 uses fragrant oil as a symbol of blessing—brotherly unity—paralleling the joy of friendship counsel.

In Psalm 45:8, fragrant myrrh and aloes and glad music echo the perfume and heart-gladness of Proverbs 27:9.

In Psalm 104:15, oil makes faces shine and wine gladdens hearts, reinforcing the same theme of oil bringing joy.

Song of Solomon 1:3 compares the beloved's name to poured-out ointment, evoking attraction—similar to how friend's counsel brings sweetness.