1 Corinthians 10.5-12 (Epistle)

5But with many of them God was not well pleased: for they were overthrown in the wilderness. 6Now these things were our examples, to the intent we should not lust after evil things, as they also lusted. 7Neither be ye idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play. 8Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand. 9Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents. 10Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer. 11Now all these things happened unto them for ensamples: and they are written for our admonition, upon whom the ends of the world are come. 12Wherefore let him that thinketh he standeth take heed lest he fall.

Matthew 16.6-12 (Gospel)

6Then Jesus said unto them, Take heed and beware of the leaven of the Pharisees and of the Sadducees. 7And they reasoned among themselves, saying, It is because we have taken no bread. 8Which when Jesus perceived, he said unto them, O ye of little faith, why reason ye among yourselves, because ye have brought no bread? 9Do ye not yet understand, neither remember the five loaves of the five thousand, and how many baskets ye took up? 10Neither the seven loaves of the four thousand, and how many baskets ye took up? 11How is it that ye do not understand that I spake it not to you concerning bread, that ye should beware of the leaven of the Pharisees and of the Sadducees? 12Then understood they how that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.

Hieromartyr Athenogenes, bishop of Sebaste, and his ten disciples (311)

“In the time of Diocletian, a fierce persecutor of Christians called Philomarchus came to Sebaste. He arrested and killed many Christians in the town. When he saw Athenogenes and his disciples, he told the elder to sacrifice to the idols, that they should not perish as had the other Christians. Athenogenes replied: ‘O Torturer, those whom you describe as having perished have not perished, but are in heaven and make merry with the angels!’ There was a touching moment when a deer, which had been hand-fed by the compassionate Athenogenes, ran up to him and, seeing him in such straits, shed tears. Wild animals of the hills had more pity on the martyrs than did the pagans! After harsh torture, during which an angel of God comforted them, they were all beheaded, first the priests and fellow workers of Athenogenes and then Athenogenes himself, and went to their heavenly home in the year 311.” (Prologue)

The Great Horologion adds “There is a second Martyr Athenogenes commemorated today, mentioned by St Basil… it is said that as this Athenogenes approached the fire, wherein he was to die a martyric death, he chanted the hymn O Joyous Light in praise of the Holy Trinity.” This is one way that we know that the vesperal hymn Gladsome Light was in use before the time of St Basil the Great.