If you are from India, you can try this format on a non judicial stamp paper:
Marriage Affidavit (Annexure D)
We, 1. Full Legal Name of Husband, 2. Full Legal Name of Wife
R/O (Full house address with postal code) in the state of (Name of Indian State/UT), India, do hereby solemnly affirm and state on oath as follows:
1. That we were married under (Hindu/Muslim/Christian) Marriage/Act/Rights/customs and are living together as married couple since (Date of Marriage).
2. That we are giving this declaration in lieu of our marriage certificate.
That our joint photographs are affixed.
Sworn and signed before me.
Place: City of Residence.
1. Signature of Husband
2. Signature of Wife.
Get it attested and notarized by a Govt. Notary in your city.
Thanks a lot @hydrakanth I really appreciate it.
