عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو (بْنِ الْعَاصِ رَضِيَ اللَّهُ عَنْهُ) أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ إِذَا رَكَعَ رَكْعَتَيِ الْفَجْرِ اضْطَجَعَ عَلَى شِقِّهِ الْأَيْمَنِ
It is narrated from Sayyiduna Abdullah bin Amr bin Aas (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) would perform the two rak'ahs of Fajr, he would lie down on his right side.