When is the first washing for ghusl from janabah, is it when washing the hands first or when pouring water over the body? And what is the meaning of "he seeks warmth from me"? And does that indicate that he embraced Aisha -may Allah be pleased with her- before her ghusl, and why did he not use a towel instead of embracing her?

The aforementioned hadith has a weak chain of transmission (isnad) and is not authentically established from the Prophet, peace and blessings be upon him, because its chain includes Hurayth ibn Abi Matar al-Fazari, who is weak. The first step in ritual bathing (ghusl) after major ritual impurity (janabah) is washing the first limb after forming the intention.