Reference: Siyar A’laam an-Nubalaa – Volume 19, Page 85
[Regarding Abu Bakr al-Hamawee], Abu ‘Alee as-Sadafee said:
He was pious, and an ascetic.
As for [his knowledge of] fiqh, then it used to be said:
‘If the math.hab of ash-Shaafi’ee disappeared, he was capable of dictating it [all] from memory.’