Offertory in the context of Eucharist

A chant (from French chanter, from Latin cantare, "to sing") is the iterative speaking or singing of words or sounds, often primarily on one or two main pitches called reciting tones. Chants may range from a simple melody involving a limited set of notes to highly complex musical structures, often including a great deal of repetition of musical subphrases, such as Great Responsories and Offertories of Gregorian chant. Chant may be considered speech, music, or a heightened or stylized form of speech. In the Late Middle Ages, some religious chant evolved into song (forming one of the roots of later Western music).

An antiphon (Greek ἀντίφωνον, ἀντί "opposite" and φωνή "voice") is a short chant in Christian ritual, sung as a refrain. The texts of antiphons are usually taken from the Psalms or Scripture, but may also be freely composed. Their form was favored by St. Ambrose and they feature prominently in Ambrosian chant, but they are used widely in Gregorian chant as well. They may be used during Mass, for the Introit, the Offertory or the Communion. They may also be used in the Liturgy of the Hours, typically for Lauds or Vespers.

They should not be confused with Marian antiphons or processional antiphons.

The International Day of Prayer for the Persecuted Church (often abbreviated as IDOP) is an observance within the Christian calendar in which congregations pray for Christians who are persecuted for their faith. It falls on the first Sunday of November, within the liturgical period of Allhallowtide, which is dedicated to remembering the martyrs and saints of Christianity. The International Day of Prayer for the Persecuted Church is observed by many Christian denominations, with over 100,000 congregations honoring the holiday worldwide. Congregations focus on "praying for individuals, families, churches, or countries where Christians are facing hard situations." Additionally, many congregations donate funds from their collection of tithes and offerings on the International Day of Prayer for the Persecuted Church to NGOs that support human rights of persecuted Christians, such as Voice of the Martyrs, International Christian Concern, and Open Doors.