Liturgy zu Bamidbar 21:8

“And so it was, when Moshe raised his hand, Israel prevailed…” (Exodus 17:11). And is it Moshe’s hands that make [success in] war or break [success in] war? Rather, [this comes to] tell you, [that] whenever Israel would look upward and subjugate their hearts to their Father in heaven, they would prevail; and if not, they would fall. Similar to this matter, you [can] say concerning the verse; “Make a [graven] snake and place it on a pole, and everyone bitten who sees it will live” (Numbers 21:8): And is it the snake that kills or [is it] the snake that [revives]? Rather, whenever Israel would look upward and subjugate their hearts to their Father in heaven, they would be healed; and if not, they would be harmed.