ANSWER:

Shaking hands after every prayers is an innovation, no problem to greet each other if you didn’t see them for a while. 

Sheikh Can we greet each other with salam in the mosque after prayers or can someone answer by shaking hands even though he is making a du`aa’ (supplication) to Allah at that time?

Innovations, Prayer | December 11, 2017 6:14 pm
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Fard prayers or any prayers if I forget to recite sura after Fatiha what do I do?