Sayyiduna Abu Kahil (may Allah be pleased with him) said: A dispute arose between two men from among the Companions of the Messenger of Allah (peace and blessings be upon him), until they came to blows. I met one of them and said: What is the matter between you and so-and-so? I have heard him praising you highly and praying for you a great deal. Then I met the other and said something similar to him, and I kept going back and forth between them until they were reconciled. Then I said (to myself): What have I done? I have destroyed myself, though I have made peace between them. So I came to the Prophet (peace and blessings be upon him) and told him the whole matter. I said: O Messenger of Allah, by the One who sent you with the truth, I did not hear anything of the sort from this one, nor anything from that one. He (peace and blessings be upon him) said: "O Abu Kahil, make peace between people, even if it is by such-and-such" - he used a word that I did not understand. So I asked: What did he (peace and blessings be upon him) mean by it? (The one who answered) said: He (peace and blessings be upon him) meant lying.
Hadith Referenceالمعجم الكبير للطبراني / باب القاف / 16018