John 7:17

If any one will do his will, he shall know of the teaching whether it is from God or whether I speak from myself.

1 John 2:3-4

And by this we know that we have known him, if we keep his commandments.

Treasury of Scripture Knowledge

Summary

LORD, I have hoped for thy salvation, and done thy commandments.

Bible References

And done

John 7:17
If any one will do his will, he shall know of the teaching whether it is from God or whether I speak from myself.
1 John 2:3
And by this we know that we have known him, if we keep his commandments.