abu masood al-ansari, with whom allah is pleased, said:

'a man came to the prophet, may allah exalt his mention, and said: "o messenger of allah! by allah! i do not pray fajr prayer because so and so lengthens the prayer." he said: 'i have never seen the messenger of allah, may allah exalt his mention, deliver a speech in such an angry state. he said:

'o people! verily there are among you those who chase people away! if you lead people in prayer, shorten the prayer. there are old and weak people and those with special needs behind you in prayer.'  (bukhari #670)

osama bin zaid, with whom allah is pleased, said:

‘we were sitting with the messenger of allah, may allah exalt his mention. one of his daughters sent a person calling him to visit her and see her son, who was on his deathbed. the messenger of allah, may allah exalt his mention, told the person to tell her: 'truly to allah belongs what he took, and he has given everything a set time. command her to be patient and to seek the reward of allah, the exalted.' his daughter, with whom allah is pleased, sent the same person back again saying: 'o prophet of allah! your daughter took an oath that you should come.’ the messenger of allah, may allah exalt his mention, got up, and sa'd bin ubaadah and mu’adth bin jabal accompanied him. the messenger of allah, may allah exalt his mention, sat with the child while he was on his deathbed. the child’s eyes froze in their places like stones. upon seeing that, the messenger of allah, may allah exalt his mention, wept. sa'd said to him, ‘what is this 'o prophet of allah?’ he said: ‘this is a mercy that allah, the exalted, places in the hearts of his slaves. truly, allah is merciful to those who are merciful towards others.’  (bukhari #6942)