In the name of allah, the Beneficent, the Merciful What is sin in Islam?

"There hath come unto you a Messenger, (one) of yourselves, unto whom aught that ye are overburdened is grievous, full of concern for you, for the believers full of pity and merciful." (9 : 128)
"Muhammad is not the father of any man among you. but he is the Messenger

of Allah and the Seal of the Prophets and Allah is Aware of all things"

(33:40)
" We sent thee (0 Muhammad) not save as a mercy for the peoples."

(21:107)
"Lo ! Allah and His angels shower blessing.; on the Prophet. 0 ye who believe 1

Ask belching on him and salute him with a worthy salutation."

(33:56)