Here are some times from the services of Holy Pentecost.

Blessed art Thou O Christ Our God / THou have revealed the fishermen as most wise / By sending down upon them the Holy Spirit / Through them Thee drew the world into Thy net / O Lover of Man, Glory to Thee!
(Troparion of Pentecost)

"In the liturgical services of the feast of Pentecost, the coming of the Holy Spirit is celebrated together with the full revelation of the divine Trinity: Father, Son, and Holy Spirit. The fulness of the Godhead is manifested with the Spirit's coming to man, and the Church hymns celebrate this manifestation as the final act of God's self-disclosure and self-donation to the world of His creation. For this reason Pentecost Sunday is also called Trinity Day in the Orthodox tradition. ...

The Divine Liturgy of Pentecost recalls our baptism into Christ with the verse from Galatians again replacing the Thrice-Holy Hymn. Special verses from the psalms also replace the usual antiphonal psalms of the liturgy. The epistle and gospel readings tell of the Spirit's coming to men. The kontakion sings of the reversal of Babel as God unites the nations into the unity of his Spirit. The troparion proclaims the gathering of the whole universe into God's net through the work of the inspired apostles. The hymns 0 Heavenly King and We have seen the True Light are sung for the first time since Easter, calling the Holy Spirit to "come and abide in us", and proclaiming that "we have received the heavenly Spirit." The church building is decorated with flowers and the green leaves of the summer to show that God's divine Breath comes to renew all creation as the "life-creating Spirit."
(Fr. Thomas Hopko)