This is incorrect. The Prophet salla Allahu alaihi wa sallam always did it and we should follow him.

There are people who say that prophet(PBUH) sometimes did rafayadain and sometimes not, and they dont do rafayadain even if there is clear hadith and proofs in front of them, are they sinning? and how should we tell them that they should do it because its the way of PROPHET(PBUH) jazakALLAH khair.