Narrated 'Umar:

There was a man from the Ansar (who was a friend of mine). If he was not present in the company of Allah's Apostle I used to be present with Allah's Apostle, I would tell him what I used to hear from Allah's Apostle, and when I was absent from Allah's Apostle he used to be present with him, and he would tell me what he used to hear from Allah's Apostle .

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ عُبَيْدِ بْنِ حُنَيْنٍ، عَنِ ابْنِ عَبَّاسٍ، عَنْ عُمَرَ ـ رضى الله عنهم ـ قَالَ وَكَانَ رَجُلٌ مِنَ الأَنْصَارِ إِذَا غَابَ عَنْ رَسُولِ اللَّهِ ﷺ وَشَهِدْتُهُ أَتَيْتُهُ بِمَا يَكُونُ مِنْ رَسُولِ اللَّهِ ﷺ وَإِذَا غِبْتُ عَنْ رَسُولِ اللَّهِ ﷺ وَشَهِدَ أَتَانِي بِمَا يَكُونُ مِنْ رَسُولِ اللَّهِ ﷺ.