Story about a man who wants to convert into islam.

It was 11.50am when I had class with Teacher Marziana(my Islamic Studies tc), she tells a story to us. So here it goes,

A man meet with Prophet Muhammad S.A.W and asked him, "O prophet, can I convert into Islam but still gamble, robbed and do everything that a non-muslim did?" Then prophet said, "Yes u may, in one conditon, u are forbidden to lie to anyone." So he became a muslim. One day he gamble, then a person asked him, do you gamble? He remembered what prophet told him not to lie, so when he have to answer the question, he feels a shame of himself. Until then, he became a very pious person.

Moral of the story: DO NOT LIE :D