That the Prophet (ﷺ) said, "Whoever fasts a day in the cause of Allah, Allah shall put between him and the Fire a trench whose distance is like that between the heavens and the earth."

This Hadith is Gharib as a narration of Abu Umamah.
Jami` at-Tirmidhi Book 22, Hadith 6
← Previous Hadith That the Prophet (ﷺ) said: "A worshipper does not fast a day in the cause of Allah except that, that day (of fasting) distances the Fire from his face by seventy autumns."

This Hadith is Hasan Sahih.

Jami` at-Tirmidhi Book 22, Hadith 5 Next Hadith → That the Messenger of Allah (ﷺ) said: "Whoever spends a sum in the cause of Allah, it is recorded for him seven-hundred fold."

There are something on this topic from Abu Hurairah.

This Hadith is Hasan, we only know of it from the narration of Ar-Rukain bin Ar-Rabi' (a narrator in the chain of this Hadith)

Jami` at-Tirmidhi Book 22, Hadith 7