Asim bin Laqit bin Sabirah narrates from his father that he and a companion of his came to Sayyidah Aishah (may Allah be pleased with her); they were looking for the Messenger of Allah (peace and blessings be upon him), but they did not find him, so Sayyidah Aishah (may Allah be pleased with her) fed them dates and 'asidah (a flour pudding). They had not stayed long when the Messenger of Allah (peace and blessings be upon him) arrived, walking in a dignified manner, and said: "Has anyone fed you two anything?" I said: Yes, O Messenger of Allah! Then I said: O Messenger of Allah! Tell us about the prayer. He (peace and blessings be upon him) said: "Perform ablution thoroughly, pass (water) between the fingers, and when you sniff water into your nose, do so deeply, but not while fasting."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 236