ENOfficial
The above mentioned tradition has also been narrated by ‘Amr bin Shu’aib from his father, from his grandfather, from the Prophet (SWAS) to the same effect. This version has: regarding the stray sheep he said: Take it (and keep it with you) till its seeker comes to it.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، ح وَحَدَّثَنَا ابْنُ الْعَلاَءِ، حَدَّثَنَا ابْنُ إِدْرِيسَ، عَنِ ابْنِ إِسْحَاقَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم بِهَذَا . قَالَ فِي ضَالَّةِ الشَّاءِ " فَاجْمَعْهَا حَتَّى يَأْتِيَهَا بَاغِيهَا " .
sunnah.com