Captivity and the Preservation of Chastity
When his Saracen master compelled Malchus to marry a fellow slave, he was confronted with a coerced union that threatened the chastity central to his monastic vocation. According to the account, Malchus refused to consummate the marriage and declared he would take his own life rather than break his vow.
His captive wife, whose own husband had been sold to another master, proposed instead that the two live together 'as brother and sister.' Malchus accepted, and the pair maintained a chaste companionship while concealing the true nature of their relationship from their master. The episode became the moral center of his later teaching.