Isaiah 7:14-17 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel. [15] Butter and honey shall he eat, that he may know to refuse the evil, and choose the good. [16] For before the child shall know to refuse the evil, and choose the good, the land that thou abhorrest shall be forsaken of both her kings. [17] The LORD shall bring upon thee, and upon thy people, and upon thy father's house, days that have not come, from the day that Ephraim departed from Judah; even the king of Assyria.
Ever notice how the Lord himself is the one that gives here?
God knows the beginning from the ending.
He would know what is going to happen to Jesus.
He would know who is going to serve Him and who is going to refuse Him.