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In page Seven deadly sins:

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In Catholicism, the classification of deadly sins into a group of seven originated with Tertullian and continued with Evagrius Ponticus.[2] The concepts were partly based on Greco-Roman and Biblical antecedents.[citation needed] Later, the concept of seven deadly sins evolved further, as shown by historical context based on the Latin language of the Roman Catholic Church, though with significant influence from the Greek language and associated religious traditions. Knowledge of this concept is evident in various treatises; in paintings and sculpture (for example, architectural decorations on churches in some Catholic parishes); and in some older textbooks.[1] Further knowledge has been derived from patterns of confession.