Reference: Siyar A’laam an-Nubalaa – Volume 4, Page 86
‘Abdur-Rahmaan ibn ‘Imaarah ibn ‘Uqbah said:
I attended the funeral of al-Ahnaf [ibn Qays] in Koofaa, and was amongst those who descended down into his grave. And when I had levelled it [ready for his body to then be placed inside], I saw how it had been made wide and spacious – as far as my eyes could see! So I told my companions about this, but none of them had seen what I had seen.