Dear Sadegh your stories correct form :
One (not "A") Night (without The) Prophet was (was is necessary) cried a lot ,do you know why? because his followers sinned. that night (its better to not use "in") he cried until (with one "L") his clothes wetted (for past form you should use wet or wetted) completely.
in that time he said ("to" is not necessary) his god:
lets promise together (that) you don't say anything about my followers sins to anybody (not any-body)
do you know what did God answered ? (past form of "answer")
he said (that) : i want to (to is needed) say something (this place need :something) to you and that is this:
my dear human, i wont (wont instead of don't) say your followers sins even to you.
thank dear