Salman al-Farsi (may Allah be pleased with him) says: I read in the Torah that “the blessing of food is in performing ablution after eating.” I mentioned this to the Prophet Muhammad (peace and blessings be upon him) and told him what I had read in the Torah, so he (peace and blessings be upon him) said: “The blessing of food is in performing ablution before and after eating.” © Imam Tirmidhi says:
1- We know this hadith only from the narration of Qais ibn Rabi’,
2- And Qais ibn Rabi’ is weak in narrating hadith,
3- There are also ahadith on this topic from Anas and Abu Hurairah (may Allah be pleased with them both).
Related hadith on this topic