صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب الأذان والإقامة
Chapters on Adhan and Iqamah
(86) بَابُ ذِكْرِ سُؤَالِ الْعَبْدِ رَبَّهُ- عَزَّ وَجَلَّ- مِنْ فَضْلِهِ بَيْنَ التَّكْبِيرِ وَالْقِرَاءَةِ فِي صَلَاةِ الْفَرِيضَةِ ضِدُّ قَوْلِ مَنْ زَعَمَ أَنَّ الدُّعَاءَ بِمَا لَيْسَ فِي الْقُرْآنِ يُفْسِدُ صَلَاةَ الْفَرِيضَةِ.
Chapter 86: Asking Allah for His bounty between takbir and recitation in obligatory prayer, contrary to those who claim that supplication not in the Qur’an invalidates prayer
1 hadith
Hadith 473
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to do three things which people have abandoned. When he (peace be upon him) would stand for prayer, he would raise his both hands open, and before recitation, he would stand for a while and ask Allah Almighty for His grace and bounty. And he (peace be upon him) would say takbeer whenever he bowed for ruku or prostrated or rose from them. Bundar, in his narration, mentioned these words: He (peace be upon him) used to act upon three things which people have left. When the Messenger of Allah (peace and blessings be upon him) would stand for prayer, he would raise his both hands spreading them. And he (peace be upon him) would stand for a short while before recitation, and he (peace be upon him) would say: (During this time) I ask Allah Almighty for His grace and bounty. And whenever he (peace be upon him) would bow for ruku or prostrate, he would say takbeer.