Tawoos (may Allah have mercy on him) narrates: We asked Sayyiduna Ibn Abbas (may Allah be pleased with them both) about sitting with the buttocks placed on the feet between the prostrations. He replied: That is Sunnah. We said: When a person does this (sits like this), do you consider it good? He replied: Why not, it is the Sunnah of your Prophet (peace and blessings of Allah be upon him).