It wasnarrated from Ibn 'Umar that:
When the Prophet (ﷺ) observedI'tikaf, his bedding would be spread for him, or his bed would beplaced there for him, behind the Pillar or Repentance. (JA)
English reference (JA): Vol. 1, Book 7, Hadith 1774 (JA)
Arabic reference (JA): Book 7, Hadith 1846 (JA)