 
 <translate> Consider the question. The concept of original sin was first alluded to in the 2nd century by Irenaeus, Bishop of Lyon in his controversy with certain dualist Gnostics. Other church fathers such as Augustine also developed the doctrine, seeing it as based on the New Testament teaching of Paul the Apostle (Romans 5: 12 -- 21 and 1 Corinthians 15: 22) and the Old Testament verse of Psalms 51: 5. Tertullian, Cyprian, Ambrose and Ambrosiaster considered that humanity shares in Adam's sin, transmitted by human generation. Augustine's formulation of original sin was popular among Protestant reformers, such as Martin Luther and John Calvin, who equated original sin with concupiscence (or "hurtful desire"), affirming that it persisted even after baptism and completely destroyed freedom. The Jansenist movement, which the Catholic Church declared to be heretical, also maintained that original sin destroyed freedom of will.

Answer this question based on the passage: when did the doctrine of original sin begin?
 What is the step-by-step reasoning process to arrive at the answer: the 2nd century? <hau> Ka yi la'akari da wannan tambayar. An fara ambaton ra'ayin zunubin asali a ƙarni na 2 ta Irenaeus, Bishop na Lyon a cikin rikice-rikicen sa da wasu Gnostics masu dualist. Sauran iyayen coci kamar Augustine suma sun haɓaka koyarwar, suna ganin ya dogara ne akan koyarwar Sabon Alkawari na Manzo Bulus (Romawa 5: 12 - 21 da 1 Korantiyawa 15: 22) da Tsohon Alkawari ayar Zabura 51: 5. Tertullian, Cyprian, Ambrose da Ambrosiaster sun yi la'akari da cewa 'yan adam suna da hannu cikin zunubin Adamu, wanda aka ba da shi ta wurin 'yan adam. Kalaman Augustine game da zunubi na fari sun yi farin jini a tsakanin 'yan gyara na Furotesta, kamar su Martin Luther da John Calvin, waɗanda suka kamanta zunubi na fari da sha'awa (ko "sha'awa mai lahani"), suna tabbatar da cewa ya ci gaba har bayan baftisma kuma ya halaka 'yanci gaba ɗaya. Ƙungiyar Jansenist, wadda Cocin Katolika ta ce ridda ce, ita ma ta ce zunubin farko ya halaka 'yancin zaɓe.  Ka amsa wannan tambayar bisa ga wannan nassi: a wane lokaci ne koyarwar zunubi na asali ya soma? Menene tsarin tunani mataki-mataki don isa ga amsar: ƙarni na biyu? 