Mishkat al-Masabih 4249

Anas or someone else told that God's messenger asked permission to enter the house of Sa'd b. 'Ubada saying, "Peace and God's mercy be upon you," and Sa'd replied, "And upon you be peace and God's mercy," but did not speak loud enough for the Prophet to hear. He gave the salutation three times and Sa'd responded three times, but did not speak loud enough for him to hear, so the Prophet went away. Sa'd went after him and said, "Messenger of God, for whom I would give my father and mother as ransom, you did not give a salutation without my hearing it and responding to you, but I did not speak loud enough for you to hear because I wanted to receive many of your salutations and so receive great blessing." They then entered the house and he offered him raisins which God's prophet ate. Then when he finished he said, "May the righteous eat your food, may the angels invoke blessings on you, and may those who have been fasting break their fast with you!" It is transmitted in Sharh as-sunna.