Monday of the Holy Spirit
As it is the custom of the Church, on the day after every great Feast, to honour those through whom it came to pass our Lady on the day after the Lord's Nativity, Joachim and Anna after our Lady's Nativity, the holy Baptist the day after Theophany, and so forth, on this day we honour our God the All-holy Spirit, the Comforter promised by our Saviour to His disciples (John 14:16), Who descended upon them at holy Pentecost and guided them "into all truth" (ibid. 16:13), and through them, us.
Rest from labour.
Apolytikion of Monday of the Holy Spirit in the Plagal of the Fourth Tone
Blessed are You, O Christ our God, who made fishermen all-wise, sending upon them the Holy Spirit and, through them, netting the world. O Loving One, glory to You.
Kontakion of Monday of the Holy Spirit in the Plagal of the Fourth Tone
When the Most High came down and confounded tongues of men (Babel), He divided the Nations. When He dispensed the Tongues of Fire, He called all to unity, and with one voice we glorify the Most Holy Spirit.