مسند أحمد

It was narrated that `Ali bin Abi Talib (رضي الله عنه) said: I was a man who emitted a great deal of madhi and I started to do ghusl in the winter, until the skin of my back became cracked. I mentioned that to the Prophet (ﷺ), or it was mentioned to him, and he said: “Do not do that. If you see madhi, then wash your private part and do wudoo’ as for prayer, but if water gushes out, then do ghusl.`