‏الأيمان : Hadeeth No:4072 Ibn 'Umar reported that Umar (b. Khattab) said: Messenger of Allaah, I had taken a vow during the days of Ignorance (Jahiliyya) that I would observe I'tikaf for a night in the Sacred Mosque. He (the Prophet) said: Fulfil your vow....

‏الحيض : Hadeeth No:711 This hadith has been transmitted on the authority of Ibn 'Abbas by another chain of transmitters....