At-Tawba 9:121

Nor do they spend anything [for Allah’s cause], small or large, or cross a valley, but it is recorded for them, so that Allah may give them the best reward for what they used to do.

Nor do they spend an expenditure, small or large, or cross a valley but that it is registered for them that Allāh may reward them for the best of what they were doing.

121. Nor do they spend anything (in Allâh’s Cause) - small or great - nor cross a valley, but is written to their credit that Allâh may recompense them with the best of what they used to do (i.e. Allâh will reward their good deeds according to the reward of their best deeds which they did in the most perfect manner).[27]

[27] (V.9:121)
a) Islâm demolishes all the previous evil deeds and so do migration (for Allâh’s sake) and Hajj (pilgrimage to Makkah). (Sahih Muslim, Vol.1, Chapter 52, Page 18)
b) What is said regarding the superiority of a person who embraces Islâm sincerely.
Narrated Abu Sa‘îd Al-Khudrî رضي الله عنه: Allâh’s Messenger صلى الله عليه وسلم said, "If a person embraces Islâm sincerely, then Allâh shall forgive all his past sins, and after that starts the settlement of accounts: the reward of his good deeds will be ten times to seven hundred times for each good deed, and an evil deed will be recorded as it is unless Allâh forgives it." (Sahih Al-Bukhari, Vol.1, Hadith No. 40A)
Narrated Abu Hurairah رضي الله عنه : Allâh’s Messenger صلى الله عليه وسلم said, "If anyone of you improves (follow strictly) his Islâmic religion, then his good deeds will be rewarded ten times to seven hundred times for each good deed and a bad deed will be recorded as it is." (Sahih Al-Bukhari, Vol.1, Hadith No.4DB)

Nor spend they any spending, small or great, nor do they cross a valley, but it is recorded for them, that Allah may repay them the best of what they used to do.