Abu Darda reported,

I was sitting with the Prophet ﷺ when Abu Bakr approached, holding the edge of his garment so high that his knee was exposed.The Prophet ﷺ said, "Your companion has had a quarrel."Abu Bakr greeted him and said, "Something happened between me and Ibn al-Khattab. I spoke harshly to him, then regretted it and asked him to forgive me, but he refused. So I came to you."The Prophet ﷺ said, "May Allah forgive you, Abu Bakr," repeating it three times.Then Umar regretted what had happened and went to Abu Bakr's house and asked, "Is Abu Bakr here?"They said, "No."So he came to the Prophet ﷺ and greeted him. The Prophet's ﷺ face began to show displeasure, until Abu Bakr became apprehensive. He knelt on his knees and said, "Messenger of Allah, by Allah, I was the one in the wrong," saying it twice.The Prophet ﷺ said, "Allah sent me to you, and you said, 'You have lied,' but Abu Bakr said, 'He has spoken the truth,' and he supported me with himself and his wealth. Will you not leave my companion alone for my sake?" He said it twice.After that, Abu Bakr was never harmed again.

عن أبي الدرداء قال

كنت جالسا عند النبي ﷺ إذ أقبل بكر آخذا بطرف ثوبه حتى أبدى عن ركبته، فقال النبي ﷺ: أما صاحبكم فقد غامر. فسلم وقال: إني كان بيني وبين ابن الخطاب شيء، فأسرعت إليه، ثم ندمت فسألته أن يغفر لي، فأبى علي، فأقبلت إليك، فقال: يغفر الله لك يا أبا بكر. ثلاثا، ثم إن عمر ندم، فأتى منزل أبي بكر، فسأل: أثم أبو بكر؟ فقالوا: لا. فأتى إلى النبي ﷺ، فسلم، فجعل وجه النبي ﷺ يتمعر حتى أشفق أبو بكر، فجثا على ركبتيه، فقال: يا رسول الله، والله أنا كنت أظلم، مرتين، فقال النبي ﷺ: إن الله بعثني إليكم فقلتم: كذبت، وقال أبو بكر: صدق، وواساني بنفسه وماله، فهل أنتم تاركوا لي صاحبي؟ مرتين، فما أوذي بعدها.