The Prophet ﷺ said, "Some men will come to you from the direction of the east seeking knowledge. When they come to you, treat them well."Whenever Abu Saeed saw us, he would say, "Welcome to those whom the Messenger of Allah ﷺ entrusted to our care."He said, this is a hadith we know only through the narration of Abu Harun from Abu Saeed.
حدثنا قتيبة حدثنا نوح بن قيس عن أبي هارون العبدي
عن النبي ﷺ قال يأتيكم رجال من قبل المشرق يتعلمون فإذا جاءوكم فاستوصوا بهم خيرا قال فكان أبو سعيد إذا رآنا قال مرحبا بوصية رسول الله ﷺ قال هذا حديث لا نعرفه إلا من حديث أبي هارون عن أبي سعيد
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[Its isnad is very daif]Khatib also narrated it, 14/387, from the hadith of Abu Harun Abdi through the same route. See the previous hadith for its defect.