Sitting in al-iq3aa' between the two prostrations: It is narrated on the authority of Abu Zubayr that he heard Tawus say: We asked Ibn 'Abbas about al-iq3aa' . He said: "It is sunnah." We said to him: "We find it hard upon the feet." Ibn 'Abbas said: "It is the sunnah of your Prophet sallallahu alayhi wa salam." [Muslim: 1198]  al-iq3aa' is to prop up the two feet and sit on the heels. It is done when sitting between two sajdahs (prostrations).