'Hereby' in the Bible

And hereby we know that we know him, if we keep his commandments.

but whoever keeps his word, in him verily the love of God is perfected. Hereby we know that we are in him.

Hereby we have known love, because he has laid down his life for us; and we ought for the brethren to lay down our lives.

And hereby we shall know that we are of the truth, and shall persuade our hearts before him --

And he that keeps his commandments abides in him, and he in him. And hereby we know that he abides in us, by the Spirit which he has given to us.

Hereby ye know the Spirit of God: every spirit which confesses Jesus Christ come in flesh is of God;

Hereby we know that we abide in him and he in us, that he has given to us of his Spirit.

Hereby know we that we love the children of God, when we love God and keep his commandments.