'Hereby' in the Bible

And let it come to pass, that the maiden to whom I shall say, Let down thy pitcher, I pray thee, that I may drink, and who will say, Drink, and I will give thy camels drink also, be she whom thou hast appointed for thy servant Isaac; and hereby I shall know that thou hast dealt kindly with my master.

And the man, the lord of the land, said to us, Hereby shall I know that ye are honest: leave one of your brethren with me, and take for the hunger of your households, and go,

And Moses said, Hereby ye shall know that Jehovah has sent me to do all these deeds, for they are not out of my own heart:

And Joshua said, Hereby shall ye know that the living God is in your midst, and that he will without fail dispossess from before you the Canaanites, and the Hittites, and the Hivites, and the Perizzites, and the Girgashites, and the Amorites, and the Jebusites.