Berean Standard Bible (BSB)
If anyone says, “I know Him,” but does not keep His commandments, he is a liar, and the truth is not in him.
World English Bible (WEB)
One who says, “I know him,” and doesn’t keep his commandments, is a liar, and the truth isn’t in him.
Strong's King James
He that saith{G3004}{(G5723)}, I know{G1097}{(G5758)} him{G846}, and{G2532} keepeth{G5083}{(G5723)} not{G3361} his{G846} commandments{G1785}, is{G2076}{(G5748)} a liar{G5583}, and{G2532} the truth{G225} is{G2076}{(G5748)} not{G3756} in{G1722} him{G5129}.
The F.O.G *
The one who says, 'I truly know Him,' but does not keep His commandments is a liar, and the truth is not in him.
The F.O.G Message *
Someone who says, ‘I truly know Him,’ but does not keep His commandments, is a fraud, for the truth is not in them.
Young's Literal Translation
he who is saying, ‘I have known him,’ and his command is not keeping, a liar he is, and in him the truth is not;