'Serving' in the Bible

Then Elkanah went to Ramah, to his house. Now the boy was serving Yahweh {in the presence of} Eli the priest.

Now Samuel [was] serving before Yahweh, as a boy wearing a linen ephod.

Now Eli was very old, and he heard all that his sons were doing to all Israel and that they [were] having sexual relations with the women who [were] serving [at] the entrance of [the] tent of assembly.

Now the boy Samuel was serving Yahweh {in the presence} of Eli. The word of Yahweh was rare in those days; visions were not widespread.

Take courage and be men, [you] Philistines, lest you end up serving the Hebrews just like they have served you. Be men and fight!"