Proverbs 30:6

4 Who has ascended to heaven and come down? Who has gathered the wind in His hands? Who has bound up the waters in His cloak? Who has established all the ends of the earth? What is His name, and what is the name of His Son— surely you know!

5 Every word of God is flawless; He is a shield to those who take refuge in Him.

Do not add to His words, lest He rebuke you and prove you a liar.

7 Two things I ask of You— do not refuse me before I die:

8 Keep falsehood and deceitful words far from me. Give me neither poverty nor riches; feed me with the bread that is my portion.

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

Compare

BSB
Do not add to His words, lest He rebuke you and prove you a liar.
KJV
Add thou not unto his words, lest he reprove thee, and thou be found a liar.
WEB
Don’t you add to his words, lest he reprove you, and you be found a liar.
ASV
Add thou not unto his words, Lest he reprove thee, and thou be found a liar.
DARBY
Add thou not unto his words, lest he reprove thee, and thou be found a liar.
BLB
Do not add to His words, lest He rebuke you, and you be found a liar.
ÅB
Legg ikke noe til hans ord, for at han ikke skal straffe deg, og du stå som en løgner!
OTB
Legg ikke til hans ord, ellers vil han irettesette deg, og du vil bli funnet som en løgner.
B1930
Legg ikke noget til hans ord, forat han ikke skal straffe dig, og du stå som en løgner!

Study notes (Tyndale)

Original text and word study

Cross references