τετρακόσιοι

Acts 5:36 τετρακοσίων· four hundred;

Some time ago Theudas rose up, claiming to be somebody, and about four hundred men joined him. He was killed, all his followers were dispersed, and it all came to nothing.

Here: About 400. Gamaliel's point is that the following was small and passed quickly.

Acts 7:6 τετρακόσια. four hundred.

God told him that his descendants would be foreigners in a strange land, and that they would be enslaved and mistreated four hundred years.

Here: The length of the ordeal, taken from Genesis 15:13. It closes the sentence and may cover the whole period of exile and oppression, not only the slavery. Compare the 430 years of Exodus 12:40 and Galatians 3:17 (see Debates).

Acts 13:20 τετρακοσίοις four hundred

All this took about 450 years. After this, God gave them judges until the time of Samuel the prophet.

Here: First part of the number. It recalls the 400 years of foreign oppression foretold to Abraham (Genesis 15:13, cited in Acts 7:6).

Galatians 3:17 τετρακόσια four hundred

What I mean is this: The law that came 430 years later does not revoke the covenant previously established by God, so as to nullify the promise.

Here: Part of the figure 430. It comes from Exodus 12:40 as the Greek Old Testament reads it.