Arabic (Original)
حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ عَنْ سَعِيدِ الْجُرَيْرِيِّ عَنْ أَبِي نَضْرَةَ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ سَلَّمَ عَبْدُ اللَّهِ بْنُ قَيْسٍ أَبُو مُوسَى الْأَشْعَرِيُّ عَلَى عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ تَعَالَى عَنْهُمْ ثَلَاثَ مَرَّاتٍ فَلَمْ يُؤْذَنْ لَهُ فَرَجَعَ فَأَرْسَلَ عُمَرُ فِي أَثَرِهِ لِمَ رَجَعْتَ قَالَ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ إِذَا سَلَّمَ أَحَدُكُمْ ثَلَاثًا فَلَمْ يُجَبْ فَلْيَرْجِعْ.
English Translation
Abd al-Razzaq narrated to us: Ma'mar informed us, from Sa'id al-Jurayri, from Abu Nadra, from Abu Sa'id al-Khudri, who said: Abdullah b. Qays, Abu Musa al-Ash'ari, gave the greeting of peace to Umar b. al-Khattab, may Allah Almighty be pleased with them, three times, but was not given permission to enter, so he went back. Umar sent someone after him: "Why did you go back?" He said: "I heard the Messenger of Allah, peace and blessings be upon him, say: 'If one of you gives the greeting three times and is not answered, let him go back.'"