At-Tufayl ibn Ubayy ibn Ka'b related that he used to visit 'Abdullah ibn 'Umar and would go with him to the market. He said, "When we went to the market, 'Abdullah ibn 'Umar did not pass by any rubbish collector nor merchant nor poor person nor anyone else without greeting them."
Reference: Al-Adab Al-Mufrad 1006 In-book : Book 42, Hadith 43 English translation : Book 42, Hadith 1006
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