It is narrated from Sayyida Asma bint Abi Bakr (may Allah be pleased with them both) by her freed slave Abdullah, who says: Sayyida Asma (may Allah be pleased with her) sent me to Sayyiduna Ibn Umar (may Allah be pleased with them both) to ask him about this matter: Has it reached you from Sayyida Asma (may Allah be pleased with her) that you declare three things forbidden: putting marks and designs on clothes, red silk cushions, and fasting all the days of Rajab? He replied: As for what you said that I do not fast all the days of the month of Rajab, then how would it be for the one who always fasts? As for what you mentioned about marks on clothes, that I prohibit it, I heard Sayyiduna Umar (may Allah be pleased with him) say that the Noble Prophet (peace and blessings be upon him) said: Whoever wears silk in this world will not wear it in the Hereafter.