Regarding dry ablution with two strikes
باب فِي التَّيَمُّمِ ضَرْبَتَيْنِ
Sunan Ibn Majah, Book of The Purification and its Sunnah(view book)
Sunan Ibn Majah 571
It was narrated from 'Ammar bin Yasir that:
When they did dry ablution with the Messenger of Allah, he commanded the Muslims to strike the dust with the palms of their hands, and they did not pick up any dust. Then they wiped their faces once, then they struck the dust with their palms once again and wiped their hands.
حَدَّثَنَا أَبُو الطَّاهِرِ، أَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ الْمِصْرِيُّ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَنْبَأَنَا يُونُسُ بْنُ يَزِيدَ، عَنِ ابْنِ شِهَابٍ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنْ عَمَّارِ بْنِ يَاسِرٍ، حِينَ تَيَمَّمُوا مَعَ رَسُولِ اللَّهِ ﷺ فَأَمَرَ الْمُسْلِمِينَ فَضَرَبُوا بِأَكُفِّهِمُ التُّرَابَ وَلَمْ يَقْبِضُوا مِنَ التُّرَابِ شَيْئًا فَمَسَحُوا بِوُجُوهِهِمْ مَسْحَةً وَاحِدَةً ثُمَّ عَادُوا فَضَرَبُوا بِأَكُفِّهِمُ الصَّعِيدَ مَرَّةً أُخْرَى فَمَسَحُوا بِأَيْدِيهِمْ .