Manoah knew that # 07_JUD_13_21 # But the angel of the LORD did no more appear to Manoah and to his wife. Then Manoah knew that he [was] an angel of the LORD. 
Noah knew that # 01_GEN_08_11 # And the dove came in to him in the evening; and, lo, in her mouth [was] an olive leaf plucked off: so Noah knew that the waters were abated from off the earth.