question #1 Sahih al-Bukhari 252, Book 5, Hadith 5 : What is the significance of using a specific amount of water for bathing in Islamic tradition?

While I and my father were with Jabir bin `Abdullah, some people asked him about taking a bath. He
replied, “A Sa` of water is sufficient for you.” A man said, “A Sa` is not sufficient for me.” Jabir said,
“A Sa` was sufficient for one who had more hair than you and was better than you (meaning the
Prophet).” And then Jabir (put on) his garment and led the prayer.