Muwatta Malik · Hadith 911

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

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).