From the book An Interpretation of the Divine Liturgy Based on Actual Events and Experiences of Holy Priests, Monks and Lay People by Protopresbyter Stephanos K. Anagnostopoulos when writing about the litany of the catechumens he explains the different categories of penitents:
Firstly: The excommunicated. The Church would cut them off completely from its Body and considered them as dead. Only after a repentance that was big and proven in action after they had confessed and signed a libel, would they again be received in her bosom. Moreover, “the ones who had denied God through sin” belonged to this category. According to the sacred Canons, those who were absent from Divine Worship for three Sundays consecutively without any serious reason – like health reasons – were excommunicated as well. Today this measure has been abolished. In those days it was applied and thus its results were beneficial. The Church would decide and the Christians were totally obedient.
Secondly: The crying and afflicted. It concerned those who had committed deadly sins, who remained outside the Temple, in the countryside, come winter or summer (in snow, rain, cold weather, hail or extreme heat) and would ask from the Christians that would enter the Church, in lots of tears, on their knees, to pray so that God would forgive them. They would not even take Antidoron.
Thirdly: Those who fall. Inside the Temple those “falling” were constantly on their knees, even on Sundays. Due to the large number of sins they had committed they would only receive the bishop’s blessing – if there was one – of that of the priest who would perform the Liturgy, and would depart from the Church together with the Cathechumens.
Fourthly: Those who stand in obedience. They are the majority of Christians today who are under a certain penance that forbids them to receive Holy Communion. They attend the Holy Liturgy until the end and take Antidoron.
There was another category of Christians who stood in obedience. They were inside the Temple during Divine Worship, they communed Immaculate Sacraments but the Church forbade them to knead prosphoron bread, that is to say bring Precious Gifts for sanctification (offertory, nama = the wine used in the Holy Eucharist, candle, oil…) to the Temple.
Fifthly: Another category of Christians, who also remained in the Nave, departed the Holy Table together with the Catechumens. It was those who were under the influence of unclean spirits. On the one hand, they were baptized but demon-possessed.
The “Apostolic Injunction” says the following about them: When the deacon proclaimed “As many as are catechumens, depart. Depart, catechumens”, also addressing those who were under the influence of unclean spirits, he would say: “Pray for those who are under the influence of unclean spirits. Earnestly, all of you, pray for them so that our Befriended God through Jesus Christ rebukes the unclean and evil spirits and delivers His supplicants from strange authority…Those who are influenced, depart.” In other words, let them also depart. This ancient liturgical order like so many others, waned or rather was abolished.
Sixthly: the hearers. The hearers could have been the Jews or heathen idolaters who used to enter the Narthex to listen to and see the first part of the Divine Worship – and to especially attend the homily – and afterwards together with the Catechumens they would step out of the Holy Temple and the congregation.
While those crying and afflicted would remain outside, the hearers, even though they could have been Jews or heathen idolaters, would step into the Narthex!
The deacon would say aloud to the “hearers”: “Let none of the hearers remain. Let none of the unfaithful. Depart…”
During the moment of their departure the Celebrant used to pray with fervor for them, so that they would not feel embittered, supplicating: “That the Lord God, the All-Merciful, may open the ears of their hearts…catechize them with the word of truth…grant them a virtuous life…etc.”
The interest of the Church for the “hearers” was real to the point that most of them would depart the holy congregation of the Divine Worship with tears in their eyes. During these prayers the people used to chant multiple times and in a spirit of devoutness the prayer “Lord have mercy. Lord have mercy. Lord have mercy.”