(V.90:2)
a) Narrated Ibn ‘Abbâs رضي الله عنهما: On the day of the conquest of Makkah, Allâh’s Messenger صلى الله عليه وسلم said, "Allâh has made this town a sanctuary. Its thorny bushes should not be cut, its game should not be chased, and its fallen things should not be picked up except by one who would announce them publicly." (Sahih Al-Bukhari, Vol.2, Hadith No. 657)
b) See the footnote of (V.2:191).
(V.90:13) Narrated Abu Hurairah رضي الله عنه: The Prophet صلى الله عليه وسلم said: "Whoever frees a Muslim slave, Allâh will save all the parts of his body from the (Hell) Fire, as he has freed the body-parts of the slave." (Sahih Al-Bukhari, Vol.3, Hadith No.693).