It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that when "Indeed, We have granted you al-Kawthar. So pray to your Lord and sacrifice." [Surah al-Kawthar: 1-2] was revealed to the Messenger of Allah (peace and blessings be upon him), the Prophet (peace and blessings be upon him) asked Jibril (peace be upon him): "What is this sacrifice that my Lord has commanded me to make?" Jibril (peace be upon him) said: It is not that sacrifice (of an animal and the like); rather, by it Allah has commanded you that when you say the takbir for the prayer, you should raise your hands at that time, and when you bow or raise your head from the bowing you should also raise your hands. This is our prayer and also the prayer of the angels who are in the seven heavens. The Prophet (peace and blessings be upon him) said: "Raising the hands is part of the humbling about which Allah Almighty says: 'Yet they did not humble themselves before their Lord, nor did they submit with humility.' [Surah al-Mu'minun: 76]"
This narration has also been recorded, but reliance is on what has already been mentioned.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2527
Hadith Gradingمحدثین:ضعيف جدا
Hadith Takhrij«ضعيف جدا۔ اخرجه ابن حبان في المجروحين 1/177/112»