It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) named the two prostrations of forgetfulness "al-Murghimatayn" (the two that humiliate and disgrace Satan). This hadith has a sahih (authentic) chain, but the two Shaykhs did not record it, and Abu Mujahid Abdullah bin Kaysan is among the trustworthy narrators whose hadith is collected among the people of Marw.