Al-Matalib al-'Aliyah 2182 — The prohibition of honouring one of two

Nu'aym (may Allah have mercy on him) states: I was present at the court session of Sayyiduna Abu Hurayrah (may Allah be pleased with him). Meanwhile al-Harith bin al-Hakam came and sat on the cushion of Sayyiduna Abu Hurayrah (may Allah be pleased with him) on which he was reclining. Sayyiduna Abu Hurayrah (may Allah be pleased with him) assumed that he had come for some need other than a judgement. Then another man came and sat in front of Sayyiduna Abu Hurayrah (may Allah be pleased with him). He (may Allah be pleased with him) asked him: "What is your matter?" He said: "Al-Harith has demanded his right against me." So Sayyiduna Abu Hurayrah (may Allah be pleased with him) said (to al-Harith): "Get up and sit beside your opponent, for this is the Sunnah (blessed way) of Sayyiduna Abu al-Qasim (peace and blessings be upon him)."
This narration is from Musnad al-Harith; Imam al-Harith bin Abi Usamah (may Allah have mercy on him) recorded it in his Musnad.