Mark 16:5

Overview - Mark 16
An Angel declares the resurrection of Christ to three women.
Christ himself appears to Mary Magdalene;
12 to two going into the country;
14 then to the apostles;
15 whom he sends forth to preach the gospel;
19 and ascends into heaven.
Treasury of Scripture Knowledge

Mark 16:5  (King James Version)
And entering into the sepulchre, they saw a young man sitting on the right side, clothed in a long white garment; and they were affrighted.

Luke 24:3 ; John 20:8

a young
This appears to have been a different angel from that mentioned by Matthew. The latter sat in the porch of the tomb, and had assumed a terrible appearance to overawe the guard. ( Matthew 28:1 ;)but this appeared as a young man, within the sepulchre, in the inner apartment. The two angels spoken of by John (ch. 20:11 ) appeared some time after these; but whether they were the same or different cannot be ascertained; nor whether the angels which manifested themselves to the second party of women, recorded by Luke, (ch. 24:4, ) were the same or different.
Daniel 10:5 Daniel 10:6 ; Matthew 28:3 ; Luke 24:4 Luke 24:5 ; John 20:11 John 20:12

and they
Mark 6:49 Mark 6:50 Daniel 8:17 ; Daniel 10:7-9 Daniel 10:12 Luke 1:12 Luke 1:29 Luke 1:30