‏الزهد والرقائق‏ : Hadeeth No:7150 Al-Bara' b. 'Azib reported that Abu Bakr Siddlq came to the residence of my father ('Azib) and bought a haudaj from him and said to 'Azib: Send your son to my residence (to carry this haudaj), and my father said to me: Carry it (for him). So I carried it and there went along with him (with Abu Bakr)...

‏الحج : Hadeeth No:3190 This hadith has been narrated by Yabya b. Sa'id with the same chain of transmitters (and the words are):" Just as a furance removes impurity," but no mention is made of iron....