‏ Genesis 15:13

13Then the Lord said to Abram, “Know for certain
tn The Hebrew construction is emphatic, with the Qal infinitive absolute followed by the imperfect from יָדַע (yadaʿ, “know”). The imperfect here has an obligatory or imperatival force.
that your descendants will be strangers
tn The Hebrew word גֵּר (ger, “sojourner, stranger”) is related to the verb גּוּר (gur, “to sojourn, to stay for awhile”). Abram’s descendants will stay in a land as resident foreigners without rights of citizenship.
in a foreign country.
tn Heb “in a land not theirs.”
They will be enslaved and oppressed
tn Heb “and they will serve them and they will oppress them.” The verb עִנּוּ, (ʾinnu, a Piel form from עָנָה, ʾanah, “to afflict, to oppress, to treat harshly”), is used in Exod 1:11 to describe the oppression of the Israelites in Egypt.
for 400 years.
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