Abu Hurairah reported that the Messenger of Allah said:

Whoso takes loan of the properties of men intending to pay it back, Allah gives him means to pay it, and whoso takes loan intending to destroy it, Allah will destroy him on its account. -(Bukhari)

Volume 3, Book 41, Number 585: Narrated Abu Huraira: Allah's Apostle said, "Procrastination (delay) in repaying debts by a wealthy person is injustice."

Volume 3, Book 41, Number 578: Narrated Abu Huraira: ...The Prophet said, "The best amongst you is he who pays his debts in the most handsome manner."