According to the Coptic Book of Adam and Eve (at 2:1–15), and the Syriac Cave of Treasures, Abel's body, after many days of mourning, was placed in the Cave of Treasures, before which Adam and Eve, and descendants, offered their prayers.
ɐkˈoːɹdɪŋ tə ðə kˈɑːptɪk bˈʊk ʌv ˈædəm ænd ˈiːv æt tˈuː:wˈʌn fˈɪftiːn, ænd ðə sˈɪɹiˌæk kˈeɪv ʌv tɹˈɛʒɚz, ˈeɪbəlz bˈɑːdi, ˈæftɚ mˈɛni dˈeɪz ʌv mˈoːɹnɪŋ, wʌz plˈeɪst ɪnðə kˈeɪv ʌv tɹˈɛʒɚz, bᵻfˌoːɹ wˌɪtʃ ˈædəm ænd ˈiːv, ænd dᵻsˈɛndənts, ˈɔfɚd ðɛɹ pɹˈɛɹz.