2 Thessalonians 3:3

But the Lord is faithful
Or "God" as the Vulgate Latin and Ethiopic versions read, as do also the Alexandrian and Claromontane copies. This is said for the comfort of the saints, lest they should be discouraged upon hearing that all professors of faith in Christ had it not, who might be ready to take it to themselves, and fear, that either they had it not, or if they had, that they might lose it, and fall from it. Wherefore the apostle observes to them the comfortable attribute of God's faithfulness, which he will not suffer to fail. He has promised many things, and he is faithful that has promised, who also will do them, nor will any good thing he has promised ever fail.

Who shall stablish you:
in the doctrines of the Gospel, so as not to be moved away from them, or be finally and totally seduced by those unreasonable and wicked men; and also in the grace of faith, which though it may be weakened, and there may be a falling from a degree of the steadfastness of it, as to its act and exercise, yet it shall never finally and totally fail, he who is the author will be the finisher of it; and likewise in the profession both of the doctrine and grace of faith, which true believers shall hold fast unto the end; for God will not suffer the righteous to be moved, or to depart from him; he has promised them perseverance, and he is faithful to give it to them.

And keep you from evil:
from the evil of sin; not from the being and commission of it entirely, which is not to be expected in this life; but from the dominion of it, at least from its reigning unto death, and from the damning power of it: and also from that evil one Satan; from his snares and temptations, so as to be entangled and overcome by them; for God is faithful, who will not suffer his to be tempted beyond their strength, but will enable them to bear it, and make way for their escape, and deliver out of it; and likewise from evil men, unreasonable and wicked men, so as not to be drawn aside by them, by their principles and practices, by their frowns or flatteries.