Abdullah ibn Mas'ud said: Should I not pray for you the way the Messenger of Allah ﷺ prayed? So he prayed, raising his hands only once. Abu Dawud said: This is a summarized version of a longer narration and it is not authentic with this wording.  

عَبْدُ اللَّهِ بْنُ مَسْعُودٍ أَلاَ أُصَلِّي بِكُمْ صَلاَةَ رَسُولِ اللَّهِ ﷺ قَالَ فَصَلَّى فَلَمْ يَرْفَعْ يَدَيْهِ إِلاَّ مَرَّةً  

He raised his hands once in the beginning. Some narrated: (raised his hands) once only.  

وَقَالَ بَعْضُهُمْ مَرَّةً وَاحِدَةً  

When the Messenger of Allah ﷺ began prayer, he raised his hands up to his ears, then he did not repeat.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا افْتَتَحَ الصَّلاَةَ رَفَعَ يَدَيْهِ إِلَى قَرِيبٍ مِنْ أُذُنَيْهِ ثُمَّ لاَ يَعُودُ  

The words “then he did not repeat“ were narrated to us later on at Kufah by him (Yazid). Abu Dawud said: This tradition has also been transmitted by Hushaim, Khalid, and Ibn Idris from Yazid. They did not mention the words “then he did not repeat”  

عَنْ يَزِيدَ نَحْوَ حَدِيثِ شَرِيكٍ لَمْ يَقُلْ ثُمَّ لاَ يَعُودُ قَالَ سُفْيَانُ قَالَ لَنَا بِالْكُوفَةِ بَعْدُ ثُمَّ لاَ يَعُودُ  

I saw that the Messenger of Allah ﷺ raised his hands when he began prayer, but he did not raise them until he finished (prayer). Abu Dawud said: This tradition is not sound.  

رَأَيْتُ رَسُولَ اللَّهِ ﷺ رَفَعَ يَدَيْهِ حِينَ افْتَتَحَ الصَّلاَةَ ثُمَّ لَمْ يَرْفَعْهُمَا حَتَّى انْصَرَفَ  

When the Messenger of Allah ﷺ began his prayer, he raised his hands extensively.  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلَ فِي الصَّلاَةِ رَفَعَ يَدَيْهِ مَدًّا