Which kind of context clue is it when a sentence repeats or uses words with similar meanings?

Parallel Construction. The Bible is filled with this sort of thing especially in Psalms and Proverbs and in some of the most well known poetry in the New Testament. Here is one of the best examples coming from Matthew 5:3 and forward.

Blessed are the poor in spirit: for theirs is the kingdom of heaven.

Blessed are they that mourn: for they shall be comforted.

Blessed are the meek: for they shall inherit the earth.

Blessed are they which do hunger and thirst after righteousness: for they shall be filled.

Blessed are the merciful: for they shall obtain mercy.

I'm quoting this as an example of parallel construction. It is one of the most well known examples.