descending

"coming down"

like a dove

This phrase is a simile. The "Spirit" comes down just like a dove lands on a person. (See: rc://en/ta/man/translate/figs-simile)

The word "heaven" refers to the "sky."

Some copies of this text say "Son of God"; others say "chosen one of God" (See: rc://en/ta/man/translate/translate-textvariants)

This is an important title for Jesus, the Son of God. (See: rc://en/ta/man/translate/guidelines-sonofgodprinciples)