حَدَّثَنَا يَحْيَى بْنُ حَمَّادٍ حَدَّثَنَا أَبُو عَوَانَةَ عَنِ الْأَعْمَشِ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُصَلِّي وَهُوَ بِمَكَّةَ نَحْوَ بَيْتِ الْمَقْدِسِ وَالْكَعْبَةُ بَيْنَ يَدَيْهِ وَبَعْدَ مَا هَاجَرَ إِلَى الْمَدِينَةِ سِتَّةَ عَشَرَ شَهْرًا ثُمَّ صُرِفَ إِلَى الْكَعْبَةِ
مسند امام احمد بن حنبل · Hadith 2992
It was narrated that Ibn 'Abbas (RA) said: When he was in Makkah, the Messenger of Allah (PBUH) used to pray facing Jerusalem, with the Ka'bah in front of him, (and he used to pray facing Jerusalem) for sixteen months after he migrated to Madinah, then he was told to change (the qiblah) to the Ka'bah.
Sanad
حَدَّثَنَا يَحْيَى بْنُ حَمَّادٍ حَدَّثَنَا أَبُو عَوَانَةَ عَنِ الْأَعْمَشِ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ