Albert Barnes on Matthew 27:55

Beholding afar off. They were probably not suffered to come near the cross, because it was surrounded by soldiers. They witnessed, with intense feelings, his sufferings from some convenient place as near as they could approach.

Ministering unto him. Attending him, and providing for his wants. While multitudes of men joined in the cry, Crucify him, and forsook him in his trying moments, it does not appear that any of his female followers were thus unfaithful. In the midst of all his trials, and all the contempt poured upon him, they adhered to their Redeemer. Never did female constancy shine more brightly, and never was a happier example set for all who should afterwards believe on him.

(v) "which followed" Lk 8:2,3