What does Genesis 9:23 mean?
The previous verses describe a scenario involving Noah and his sons without providing more than the barest of details. Even so, this event will have grave implications. Noah got drunk on the wine from his new vineyard (Genesis 9:21). In his drunkenness, he lay naked in his own tent. Noah's son Ham walked in, saw him naked, and went out and told his brothers.The response of Shem and Japheth reveals how seriously they and their culture took the issue of seeing another's nakedness and honoring one's father. With great care and creativity, they found a way to cover their father without ever looking at him. In this way, they honored Noah greatly.
Did Ham intend to dishonor Noah? The following verse will imply that he did, resulting in Noah's curse on Ham's descendants (Genesis 9:25). Some suggest that Ham's sin was failing to help his father by covering him—instead, Ham went to tell others what he had seen. Others believe that "what He did to [Noah]" (Genesis 9:24) was something more disturbing and personal. The extremely vague nature of the passage, in its own way, supports this idea since ancient literature was famously shy about describing certain shameful acts in any detail. In any case, whatever Ham has done is so offensive, it brings severe consequences.