‏البيوع : Hadeeth No:3854 Abu Sa'id al-Khudri (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Gold is to be paid for by gold, silver by silver, wheat by wheat, barley by barley, dates by dates, salt by salt, like by like, payment being made hand to hand. He who made an addit...

‏الأيمان : Hadeeth No:4055 This hadith is narrated on the authority of Suhail with the same chain of transmitters (with these words):" He should expiate for (breaking) the vow and do that which is better."...