It wasnarrated from 'Alqamah that Ibn Mas'ud prostrated twice fortheprostrations of forgetfulness after the Salam, and he mentionedthatthe Prophet (ﷺ) did that." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1218 (JA)
Arabic reference (JA): Book 5, Hadith 1275 (JA)