A.T. Robertson Commentary Mark 15:41

"who, when he was in Galilee, followed him, and ministered unto him; and many other women that came up with him unto Jerusalem." — Mark 15:41 (ASV)

Followed him and ministered unto him (ηκολουθουν κα διηκονουν αυτω). Two imperfects describing the long Galilean ministry of these three women and many other women in Galilee (Luke 8:1–3) who came up with him (α συναναβασα αυτω) to Jerusalem. This summary description in Mark is paralleled in Mt 27:55f. and Lu 23:49. These faithful women were last at the Cross as they stood afar and saw the dreadful end to all their hopes.