assalamu alaykum wa rahmatullah:
"One day we were praying behind the Messenger of Allah (sallalahu alayhi wa salam) and when he raised his head from the position of ruku`(bowing position), he said: “Sami Allahu leman hamidah” – ‘Allah hears the one who praises Him’. A man from behind added:
“Rabbanna wa la kal hamd – hamdan katheeran tayyiban mubarakan fih” – ‘Our Lord, all praise is due only to You, praise which is abundant, excellent and blessed.’ When we finished the prayer the Prophet said: ‘Who spoke?’ The man said, ‘I did’. He said, ‘Indeed I saw some 30 angels all scuffling to see which one of them could record it."
[Sahih Muslim]
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Spend 5 mins and learn this (if you do not know), it is a very easy way for you to gain rewards inshaAllah and forward this if you want to benefit others inshaAllah.
jazakum Allahu khayran
Fares