It is recommended but not mandatory.

Do I need to say “Sallallahu alayhi wasallam” and “alayhi salam” when Prophet Muhammad’s (salallahu alayhi wasallam) and any other prophet’s (alayhi salam) name is mentioned in the Qur’an though it is not mentioned in the translation?

Other | December 15, 2015 3:31 am
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We know that Allah doesn’t tell lies nor do zulm and other negative works which humans do, so many people say that ‘had Allah wanted or Willed to do these, Allah could have done these’, so is it the right belief or should we say Allah knows the best?
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My friend is a Sunni Muslim and has studied alot about Islam. He says that after the death of prophet Muhammad , people got so obsessed with talking about sahih hadith that at one point Abu bakr said that now if anyone comes to me asking about hadith,I will chop his head off so that people would go back to Quran more. Is this true.