In Paul’s writings we see a few Triadic patterns.
1 Cor. 12.4-6 4 There are different kinds of gifts, but the same Spirit distributes them. 5 There are different kinds of service, but the same Lord. 6 There are different kinds of working, but in all of them and in everyone it is the same God at work.
Eph. 4.4-6. 4 There is one body and one Spirit, just as you were called to one hope when you were called; 5 one Lord, one faith, one baptism; 6 one God and Father of all, who is over all and through all and in all.
Gal. 4.4-6. 4 But when the set time had fully come, God sent his Son, born of a woman, born under the law, 5 to redeem those under the law, that we might receive adoption to sonship.[b] 6 Because you are his sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba,[c] Father.”
There are many more found in Paul’s writings.
One well known triadic pattern from Paul is the blessing,
Now may the grace of our Lord Jesus Christ, the love of God and the fellowship of the Holy Spirit be with you all (2 Cor. 13.13).