In Jainism, marriages are commonly within the Jain community mainly for practical, cultural, and spiritual reasons rather than because it is a strict religious rule.

• Shared values and lifestyle: Jains aim to follow ahimsa (non-violence), sattvic living, dietary rules, and ethical commitments. A partner who shares these values helps both spouses progress on the path to liberation (moksha) without daily conflicts about these fundamentals.
• Understanding of rituals and duties: Family rituals, temple visits, puja, and the responsibilities of family life are easier when both partners come from the same Jain traditions and understand the customary practices.
• Community and social support: Jain families often rely on the broader Jain community for guidance, weddings, education, and child-rearing. A shared background makes these processes smoother.
• Differences between Digambar and Shwetambar: There are distinct practices and liturgical differences in Digambar and Shwetambar traditions. Marrying within the broader Jain community helps reduce potential conflicts about rites, calendars, and sect-specific customs. Some people do choose partners from the other Jain sect, but that can require careful alignment of practices and expectations.

Important to note:

• It is not an absolute doctrinal requirement in Jain scriptures; opinions vary among communities and families.
• Intermarriage with non-Jains (outside the Jain fold) is more complex and generally discouraged to protect core Jain practices and lineage, though individuals may navigate this differently in modern times.

If you’d like, I can share more on how Digambar and Shwetambar practices differ in weddings and daily life, with precise details from traditional sources.