this I know # 11_1KI_17_24 # And the woman said to Elijah, Now by this I know that thou [art] a man of God, [and] that the word of the LORD in thy mouth [is] truth. 
this I know # 19_PSA_41_11 # By this I know that thou favourest me, because mine enemy doth not triumph over me. 
this I know # 19_PSA_56_09 # When I cry [unto thee], then shall mine enemies turn back: this I know; for God [is] for me.