Abu Bakr once disputed with another companion about a tree. During the dispute Abu Bakr said something that he rather would not have said. He did not curse, he did not attack someone’s honor, he did not poke a fault in anyone, all he said was something that may have hurt the other companion’s feelings.
Immediately, Abu Bakr – understanding the mistake - ordered him, “Say it back to me!” The companion said, “I shall not say it back.” “Say it back to me,” said Abu Bakr, “Or I shall complain to the Messenger of Allah.” The companion refused to say it back and went on his way.
Abu Bakr went to Rasul Allah and related what had happened and what he said. Rasul Allah called that companion and asked him, “Did Abu Bakr say so and so to you?” He said, “Yes.” He said, “What did you reply.” He said, “I did not reply it back to him.” Rasul Allah said, “Good, do not reply it back to him (do not hurt Abu Bakr). Rather say, ‘May Allah forgive you O Abu Bakr!’”
The Companion turned to Abu Bakr and said, “May Allah forgive you O Abu Bakr! May Allah forgive you O Abu Bakr!” Abu Bakr turned and cried as he walked away.
Let us leave today with a resolve to revive this air Rasul Allah and his companions breathed, an air of mercy and love and brotherhood.
And Allah knows best.
Taken from here: When Friends Hurt Each Other