13. " these are limits (set) by allah; and whoso obeys allah and his
messenger, he will admit him into gardens beneath which rivers flow,
to abide therein forever;
and this is the great success."

commentary:
following the discussion of inheritance in the previous verse, here, in
this verse, the concerning laws are referred to as `the divine limits', where it
says:

" these are limits (set) by allah; ..."

these are some limits which are forbidden to pass over or transgress.
therefore, those who transgress and break the bounds of these laws are
known as sinners and criminals.
then, it speaks about those who respect these limits by observing
them, saying:

"... and whoso obeys allah and his messenger,
he will admit him into gardens beneath which rivers flow,
to abide therein forever; ..."

and, at the end of the verse, it adds:

"... and this is the great success."