By
The main article - Discourse words.
Etymology
The preposition-prefix "بِ - bi", in the sense of "with (help)", "by (using something)", "through (in the sense of connection)", "by".
Compare with English preposition «by», which has a similar meaning.
(2:273) As for the poor who face hardship in the cause of God, and cannot leave the land; the ignorant ones think they are rich from their abstention; you know them by their similitude (Arab. بِسِيمَاهُمْ, bisīmāhum), they do not ask the people repeatedly. What you spend out of goodness, God is fully aware of it.
(9:44) Those who trust to Allah (Arab. بِٱللَّهِ, bil-lahi) and the Last day will not ask your permission to strive with their money and their lives. And Allah knows about the Responsible ones.
«بِمَا - bima»
(9:77) Then He cobbed them by (instilling) hypocrisy in their hearts, until the day when they welcomed Him, because they had cleaved ( in front of) Allah, what accorded upon with him, and because they had been liars.