A.T. Robertson Commentary Luke 1:54

"He hath given help to Israel his servant, That he might remember mercy" — Luke 1:54 (ASV)

Hath holpen (αντελαβετο). Second aorist middle indicative. A very common verb. It means to lay hold of with a view to help or succour.

Servant (παιδος). Here it means "servant," not "son" or "child," its usual meaning.