A prophet was angry, and the anger subsided

Two texts side by side at the start. The Qur'an describes the anger of Musa subsiding, and then says he took up the tablets. The useful thing is the order. The action came after the subsiding, and the subsiding took time rather than being dismissed on command.

The second is the most quoted advice on this subject and it needs handling with care. Read as an instruction not to have an emotion it is not achievable, and it lands on the reader as a condemnation. The classical commentary generally reads it as being about what anger is allowed to do, and about training the disposition over a life, rather than about the feeling arriving. Where scholars read it differently, that is theirs to settle and not ours.