Psalms 49:15

Selah : a musical notation for crescendo or emphasis by action (IBD)
(30° 19´, 35° 27´)

Sheol : the place of the dead

Acts 2:27

Hades : the place of departed spirits (NIV notes); the unseen world (YC)

Acts 2:2

There is no Names related to this verses.

Colossians 4:14

Demas : a man who worked with Paul and later deserted him

Luke : the man who wrote the book of Luke and the book of Acts