Al-Hujurat · 49:2

2. O those who have faith in Allah and follow whatever He legislates! Show good manners with His Messenger: do not raise your voices in his presence nor speak loudly to him out of respect for him, like you raise your voices to each other whilst talking to them. It is feared that the rewards of your deeds are nullified if you do so, whilst you do not realise they have been nullified.