'Obey' in the Bible

And by this we may know that we know Him--if we obey His commands.

He who professes to know Him, and yet does not obey His commands, is a liar, and the truth has no place in his heart.

and whatever we ask for we obtain from Him, because we obey His commands and do the things which are pleasing in His sight.

The fact that we love God Himself, and obey His commands, is a proof that we love God's children.