Responsa for Sanhedrin 122:5
יחיד מכלל רבים להחמיר על גופו ולהקל על ממונו
it is all one whether the one or the many are seduced. Scripture however excludes an individual from the law pertaining to a multitude, and a multitude from the provisions of an individual; [viz..] an individual is excluded from the law pertaining to a multitude, in that his person is punished with greater severity, whilst his property is treated with greater leniency, whilst a multitude are excluded from the law of an individual, being personally punished with greater leniency, but their property is treated with greater severity.<span class="x" onmousemove="('comment',' Deut. XIII, 13-17 treats of a multitude that are seduced; they are to be decapitated (an easier death than stoning), and their properly destroyed. Deut. XVII, 2-5 deals with an individual (or individuals) who engage in idol worship; he is to be stoned, but nothing is said about his property, whence it may be concluded that it is left intact. Thus the individual is excluded from the law pertaining to the multitude, and vice versa, there being an aspect of greater severity and leniency in each. ');"><sup>5</sup></span>
Teshuvot Maharam
A. Nowadays that the Gentiles are all powerful, a Jewish woman who was held captive by them, even though only for the purpose of extortion, is not permitted to live with her husband (Ket. 27b). But, since in this case many Jews were held captive together, they are now able to testify which women were not violated by their captors; such women who can furnish this testimony, even by a single witness and even by a woman witness, are permitted to resume their marital relations with their husbands. The fact that the captives did not give their lives for their religion does not disqualify them as witnesses. Although a Jew is enjoined to choose death rather than be forced to worship idols, should he violate this law he would not become disqualified as a witness though he would be guilty of having committed a sin. Moreover, according to the account given by the captives, they never actually embraced Christianity, but merely listened without comment to the priest's recitation of his senseless ritual in the presence of the Gentiles. Thus, the captives never committed a sin; for a Jew is not enjoined to choose death rather than allow the Christians to deceive themselves into believing that they have converted him.
SOURCES: Am II, 80; cf. Hag. Maim., Isurei Biah 18, 6.