Hazrat Abu Ayyoob (radhiyallahu ‘anhu) says:

This is how we came to live on the upper floor. One day, a water container fell and broke. Overcome by concern, we swiftly spread our blanket over it to absorb the water before it seeped down to the lower floor. My wife - Ummu Ayyoob, and I promptly mopped up the area with our blanket, and this was the only blanket we possessed.

Daily, we would prepare meals for Rasulullah (sallallahu ‘alaihi wasallam) and send it down to him. After eating, Rasulullah (sallallahu ‘alaihi wasallam) would send the leftover food back to us. In order to acquire barakah (blessings) from Rasulullah (sallallahu ‘alaihi wasallam), Ummu Ayyoob and I would search for the place where Rasulullah (sallallahu ‘alaihi wasallam) had placed his fingers and eaten from, and we would also eat from there.

One day, we added some garlic and onions to the food. Thereafter, when Rasulullah (sallallahu ‘alaihi wasallam) sent the food back to us, we noticed that there were no impressions in the food from his blessed fingers (i.e. Rasulullah (sallallahu ‘alaihi wasallam) had not partaken of the food).

Filled with worry, I went to Rasulullah (sallallahu ‘alaihi wasallam) and said, “O Rasulullah (sallallahu ‘alaihi wasallam)! You sent the food back to us without partaking from it. We found no impression of your fingers in it. In order to acquire blessings, Ummu Ayyoob and I deliberately eat from the place where your blessed fingers leave an impression on.”

Rasulullah (sallallahu ‘alaihi wasallam) replied, “I perceived the odour of garlic and onions in the food. You may go ahead and eat it. However, since I communicate with the angels, I abstain from eating such food.”

Hazrat Abu Ayyoob (radhiyallahu ‘anhu) says, “From that day on, we never added onions and garlic to his food.”

(Seeratul Mustafa 1/41-411)