The Kitáb-i-Aqdas - The Most Holy Book
Index term: to renew furnishings of one's house, under Cleanliness
k151.
Ye have been enjoined to renew the furnishings of your homes after the passing of each nineteen years; thus hath it been ordained by One Who is Omniscient and All-Perceiving. He, verily, is desirous of refinement, both for you yourselves and for all that ye possess; lay not aside the fear of God and be not of the negligent. Whoso findeth that his means are insufficient to this purpose hath been excused by God, the Ever-Forgiving, the Most Bounteous.
n166.
Ye have been enjoined to renew the furnishings of your homes after the passing of each nineteen years
Bahá'u'lláh confirms the injunction in the Arabic Bayán regarding the renewal, every nineteen years, of the furnishings of one's home, provided one is able to do so. 'Abdu'l-Bahá relates this ordinance to the promotion of refinement and cleanliness. He explains that the purpose of the law is that one should change those furnishings that become old, lose their lustre and provoke repugnance. It does not apply to such things as rare or treasured articles, antiques or jewellery.