Hebrews 2:17,18

Heb. 2:17-18. Wherefore in all things it behooved him to be made like unto (his) brethren, that he might be a merciful and faithful high priest in things (pertaining) to God, to make reconciliation for the sins of the people. For in that he himself hath suffered being tempted, he is able to succour them that are tempted.

In Freedom of the Will, Edwards is arguing that Christ's being determined to be righteous did not preclude his virtue in so being and cites Hebrews 2:18 as partial support:

I may add to all these things, that Jesus Christ, while here in the flesh, was manifestly in a state of trial. The last Adam, as Christ is called (1 Corinthians 15:45; Romans 5:14), taking on him the human nature, and so the form of a servant, and being under the law, to stand and act for us, was put into a state of trial, as the first Adam was. Dr. Whitby mentions these three things as evidences of persons being in a state of trial (on the Five Points, pp. 298, 299): namely, their afflictions being spoken of as their trials or temptations, their being the subjects of promises, and their being exposed to Satan's temptations. But Christ was apparently the subject of each of these. Concerning promises made to him, I have spoken already. The difficulties and afflictions he met with in the course of his obedience, are called his temptations or trials (Luke 22:28), "Ye are they which have continued with me in my temptations," or trials. Hebrews 2:18, "For in that he himself hath suffered, being tempted [or tried] he is able to succor them that are tempted." And chap. Hebrews 4:15, "We have not an High Priest, which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin." And as to his being tempted by Satan, it is what none will dispute.