Proverbs 5:18

¹⁶ Let thy fountains be dispersed abroad, and rivers of waters in the streets.

¹⁷ Let them be only thine own, and not strangers’ with thee.

Let thy fountain be blessed: and rejoice with the wife of thy youth.

¹⁹ Let her be as the loving hind and pleasant roe; let her breasts satisfy thee at all times; and be thou ravished always with her love.

²⁰ And why wilt thou, my son, be ravished with a strange woman, and embrace the bosom of a stranger?

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: May your fountain be blessed, and may you rejoice in the wife of your youth:
KJV: Let thy fountain be blessed: and rejoice with the wife of thy youth.
WEB: Let your spring be blessed. Rejoice in the wife of your youth.
ASV: Let thy fountain be blessed; And rejoice in the wife of thy youth.
DARBY: Let thy fountain be blessed; and have joy of the wife of thy youth.
BLB: Let your fountain be blessed, and rejoice with the wife of your youth.

ÅB: Din kilde være velsignet, gled deg i din ungdoms hustru!
OTB: Må din kilde til glede bli velsignet, og finn glede i din ungdoms hustru.
B1930: Din kilde være velsignet, gled dig i din ungdoms hustru!

Ecclesiastes 9:9
Live joyfully with the wife whom thou lovest all the days of the life of thy vanity, which he hath given thee under the sun, all the days of thy vanity: for that is thy portion in this life, and in thy labour which thou takest under the sun.
Read in context
Malachi 2:14–15
Yet ye say, Wherefore? Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant.
Read in context
Song of Solomon 4:15
A fountain of gardens, a well of living waters, and streams from Lebanon.
Read in context
Song of Solomon 4:12
A garden inclosed is my sister, my spouse; a spring shut up, a fountain sealed.
Read in context