Reading from the Synaxarion:

Synaxis of John the Holy Glorious Prophet, Baptist, & Forerunner

Today we celebrate the Synaxis in honour of the most sacred Forerunner, since he ministered at the Mystery of the Divine Baptism of our Lord Jesus Christ.

Rest from labour. Fish allowed.

Apolytikion of Synaxis of John the Forerunner in the Second Tone: 

The memory of the just is celebrated with hymns of praise, but the Lord's testimony is sufficient for thee, O Forerunner; for thou hast proved to be truly even more venerable than the Prophets, since thou was granted to baptize in the running waters Him Whom they proclaimed. Wherefore, having contested for the truth, thou didst rejoice to announce the good tidings even to those in Hades: that God hath appeared in the flesh, taking away the sin of the world and granting us great mercy.

Kontakion of Synaxis of John the Forerunner in the Plagal of the First Tone

The Jordan accepted Your presence in the flesh and reversed its course in fear. John, fulfilling the spiritual ministry, fell back in awe. The ranks of Angels, seeing You in the flesh, baptized in the river, were amazed, and all who were in darkness were filled with light, praising You who appeared and enlightened all.