It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) was the most merciful of all people towards his family. And the Prophet (peace and blessings of Allah be upon him) had a son (Ibrahim) who was being breastfed in an area near Madinah. His foster father was a blacksmith, and we used to go to him, while he had warmed and perfumed the house with the smoke of idhkhir grass. The Prophet (peace and blessings of Allah be upon him) would kiss him and smell him.