Also see definition of "Hereby" in Word Study
Hereby
HEREBY [isbe]
HEREBY - her-bi', represents bezo'th, "in or by this" (Gen 42:15 "Hereby ye shall be proved"); ek toutou, "out of this" (1 Jn 4:6, the Revised Version (British and American) "by this"); en touto, "in this," "by this means" (1 Cor 4:4; 1 Jn 2:3,1; 3:16,19,24; 4:2,13).
Also see definition of "Hereby" in Word Study