حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّهُ قَالَ زَعَمُوا أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَبْعَثُ رِجَالاً يُدْخِلُونَ النَّاسَ مِنْ وَرَاءِ الْعَقَبَةِ ‏.‏

Yahya related to me from Malik that Nafi said, "They say thatUmar ibn al-Khattab used to send men out to bring people in frombeyond al-Aqaba." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 914
Web Ref:  Muwatta Imam Malik Book 20 Hadith 217