Faith is the first movement towards salvation

Such a change, then, from unbelief to faith—and to trust in hope and fear, is divine. And, in truth, faith is discovered, by us, to be the first movement towards salvation; after which fear, and hope, and repentance, advancing in company with temperance and patience, lead us to love and knowledge.

Clement of Alexandria
The Stromata, Book II
Chapter VI

Living by faith IS following the commandments

“Now the just shall live by faith,” which is according to the covenant and the commandments; since these, which are two in name and time, given in accordance with the [divine] economy—being in power one—the old and the new, are dispensed through the Son by one God.

…For love, on account of its friendly alliance with faith, makes men believers; and faith, which is the foundation of love, in its turn introduces the doing of good; since also fear, the pædagogue of the law, is believed to be fear by those, by whom it is believed.

Clement of Alexandria
The Stromata, Book II
Chapter VI

Good works have no advantage without faith

And now we must look also at this, that if ever those who know not how to do well, live well; for they have lighted on well-doing. Some, too, have aimed well at the word of truth through understanding. “But Abraham was not justified by works, but by faith.” It is therefore of no advantage to them after the end of life, even if they do good works now, if they have not faith.

…For the teaching of piety is a gift, but faith is grace. “For by doing the will of God we know the will of God.”

Clement of Alexandria
The Stromata, Book I
Chapter

Faith towards God justifies a man

The Lord, therefore, was not unknown to Abraham, whose day he desired to see; nor, again, was the Lord’s Father, for he had learned from the Word of the Lord, and believed Him; wherefore it was accounted to him by the Lord for righteousness. For faith towards God justifies a man;

Irenaeus of Lyons
Against Heresies, Book IV
Chapter V

Administration of the Sacraments

But we, after we have thus washed him who has been convinced and has assented to our teaching, bring him to the place where those who are called brethren are assembled, in order that we may offer hearty prayers in common for ourselves and for the baptized [illuminated] person, and for all others in every place, that we may be counted worthy, now that we have learned the truth, by our works also to be found good citizens and keepers of the commandments, so that we may be saved with an everlasting salvation. Having ended the prayers, we salute one another with a kiss.There is then brought to the president of the brethren bread and a cup of wine mixed with water; and he taking them, gives praise and glory to the Father of the universe, through the name of the Son and of the Holy Ghost, and offers thanks at considerable length for our being counted worthy to receive these things at His hands. And when he has concluded the prayers and thanksgivings, all the people present express their assent by saying Amen. This word Amen answers in the Hebrew language to γένοιτο [so be it]. And when the president has given thanks, and all the people have expressed their assent, those who are called by us deacons give to each of those present to partake of the bread and wine mixed with water over which the thanksgiving was pronounced, and to those who are absent they carry away a portion.

Justin Martyr
First Apology
Chapter LXV

Trinitarian Illustration

…being stones of the temple of the Father, prepared for the building of God the Father, and drawn up on high by the instrument of Jesus Christ, which is the cross, making use of the Holy Spirit as a rope, while your faith was the means by which you ascended, and your love the way which led up to God.

Ignatius of Antioch
Epistle to the Ephesians
Chapter IX

We reign with Christ by faith

If we please Him in this present world, we shall receive also the future world, according as He has promised to use that He will raise us again from the dead, and that if we live worthily of Him, “we shall also reign together with Him,” provided only we believe.

Polycarp
Epistle to the Philippians
Chapter V

Resurrection and Obedience are connected

But He who raised Him up from the dead will raise up us also, if we do His will, and walk in His commandments, and love what He loved, keeping ourselves from all unrighteousness, covetousness, love of money, evil speaking, false witness; …

Polycarp
Epistle to the Philippians
Chapter II

Jesus is our exchange

By what other one was it possible that we, the wicked and ungodly, could be justified, than by the only Son of God? O sweet exchange! O unsearchable operation! O benefits surpassing all expectation! That the wickedness of many should be hid in a single righteous One, and that the righteousness of One should justify many transgressors!

Mathetes
Epistle to Diognetus
Chapter IX