Hadith 509140
Chapter 20: Hajj - كتاب الحج
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 that Umar ibn al-Khattab used to send men out to bring people in from beyond al-Aqaba."
Reference Muwatta Malik 509140
USC-MSA web (English) reference : Book 20, Hadith 217