Surprisingly, it is an extremely important Mitzvah to pay your worker, (or for a service) on time. We are not aware of the need of another or how badly they may be hungering. They have earned their wages, given to you, and it is crucial not to leave them worrying, chasing you for what is theirs, the payment, feeling humiliated, losing faith. We are seldom aware of the needs of others and this mitzvah comes to wake us up, to protect the self respect and pride of others, to make sure their faith is not abused. As we keep our word impeccably, the world becomes a living temple.