'Rendering' in the Bible

for these are days of vengeance [of rendering full justice or satisfaction], so that all things which are written will be fulfilled.

For God, whom I serve with my spirit by preaching the gospel of His Son, is my witness as to how continuously I mention you

After that comes the end (completion), when He hands over the kingdom to God the Father, after He has made inoperative and abolished every ruler and every authority and power.

rendering service with goodwill, as to the Lord, and not [only] to men,

because he came close to death for the work of Christ, risking his life to complete what was lacking in your service to me [which distance prevented you from rendering personally].

It was revealed to them that their services [their prophecies regarding grace] were not [meant] for themselves and their time, but for you, in these things [the death, resurrection, and glorification of Jesus Christ] which have now been told to you by those who preached the gospel to you by the [power of the] Holy Spirit [who was] sent from heaven. Into these things even the angels long to look.