A.T. Robertson Commentary Mark 16:7

"But go, tell his disciples and Peter, He goeth before you into Galilee: there shall ye see him, as he said unto you." — Mark 16:7 (ASV)

And Peter (κα τω Πετρω). Only in Mark, showing that Peter remembered gratefully this special message from the Risen Christ. Later in the day Jesus will appear also to Peter, an event that changed doubt to certainty with the apostles (Luke 24:34; 1 Corinthians 15:5). See on Mt 28:7 for discussion of promised meeting in Galilee.