en_tn_condensed/mat/05/10.md

those who have been persecuted

"those people whom others treat unfairly"

for righteousness' sake

"because they do what God wants them to do" or "because they do what God wants them to do"

theirs is the kingdom of heaven

Here "kingdom of heaven" refers to God's rule as king. This phrase is only in the book of Matthew. If possible, keep "heaven" in your translation.