Abdullah ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, would raise his hands parallel to his shoulders when he entered into prayer, and when he exalted Allah for bowing. When he raised his head from bowing, he would likewise raise his hands and say, “Allah hears those who praise him. Our Lord, for you is praise.” The Prophet would not do so in the prostration.
Source: Ṣaḥīḥ al-Bukhārī 702, Ṣaḥīḥ Muslim 390
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
Al-Nawawi said, “The Imams came to a consensus upon the recommendation to raise the hands at the opening exaltation and they disagreed regarding other times. Al-Shafi’i, Ahmad, and the majority of scholars among the companions, may Allah be pleased with them, and those after them said it is recommend also to raise them at the time of bowing and rising from it.”
Source: Sharḥ al-Nawawī ‘alá Ṣaḥīḥ Muslim 390
عَنْ عَبْدِ اللَّهِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَرْفَعُ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ إِذَا افْتَتَحَ الصَّلَاةَ وَإِذَا كَبَّرَ لِلرُّكُوعِ وَإِذَا رَفَعَ رَأْسَهُ مِنْ الرُّكُوعِ رَفَعَهُمَا كَذَلِكَ أَيْضًا وَقَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ رَبَّنَا وَلَكَ الْحَمْدُ وَكَانَ لَا يَفْعَلُ ذَلِكَ فِي السُّجُودِ
702 صحيح البخاري أبواب صفة الصلاة باب رفع اليدين في التكبيرة الأولى مع الافتتاح سواء
390 صحيح مسلم كتاب الصلاة باب استحباب رفع اليدين حذو المنكبين مع تكبيرة الإحرام والركوع وفي الرفع من الركوع وأنه لا يفعله إذا رفع من السجود
قال النووي أَجْمَعَتِ الْأُمَّةُ عَلَى اسْتِحْبَابِ رَفْعِ الْيَدَيْنِ عِنْدَ تَكْبِيرِ الْإِحْرَامِ وَاخْتَلَفُوا فِيمَا سِوَاهَا فَقَالَ الشَّافِعِيُّ وَأَحْمَدُ وَجُمْهُورٌ مِنَ الْعُلَمَاءِ مِنَ الصَّحَابَةِ رَضِيَ اللَّهُ عَنْهُمْ فَمَنْ بَعْدَهمْ يُسْتَحَبُّ رَفْعُهُمَا أَيْضًا عِنْدَ الرُّكُوعِ وَعِنْدَ الرَّفْعِ مِنْهُ
390 شرح النووي على مسلم