Answer

If you mean the marriage ceremony section in Ādipurāṇa / Mahāpurāṇa, it is commonly cited in Parva 38, verses 122–141. In one Jain reference, 38.134 is specifically cited for विवाह-related content. ( frontdesk.co.in)

Explanation

• 38.122–131: vratāvatara and marriage-related rites. ( frontdesk.co.in)
• 38.132–141: continuation of marriage and related गृहस्थ life details. ( frontdesk.co.in)
• 38.134 is also separately cited in Jainkosh under विवाह. ( jainkosh.org)

Takeaway

So, for your note, you can write: Ādipurāṇa, Parva 38, verses 122–141; especially 38.134 for विवाह. ( frontdesk.co.in)