"Trade is like usury," but Allah hath permitted trade and forbidden usury. Those who after receiving direction from their Lord, desist, shall be pardoned for the past; their case is for Allah (to judge); but those who repeat (The offence) are companions of the Fire: They will abide therein (for ever).” (Quran 2:275)
“O ye who believe! Devour not usury, doubled and multiplied; but fear Allah. that ye may (really) prosper.” (Quran 3:130)
“O ye who believe! Fear Allah, and give up what remains of your demand for usury, if ye are indeed believers. If ye do it not, Take notice of war from Allah and His Messenger. But if ye turn back, ye shall have your capital sums: Deal not unjustly, and ye shall not be dealt with unjustly.” (Quran 2:278-279)
(You asked for Shia, but this is the word of Allaah)
May Allaah guide us to thruth, amen.