أعوذ بالله من الشيطان الرجيم

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ

As Salaamu Alaikum Wa Rahmatullahi Wa Barakatuh,

Based on your specific question and information provided.

The Islamic Scholars have divided the Islamic teachings in three parts.

1) Fundamental of Faith (Belief / Aqidah)

2) Islamic Ethics / Morals,

3) Islamic Law/ Fiqh / Jurisprudence.

The “institution of Marriage” is covered by all three.

The “Marriage Contract” is cover by Islamic Jurisprudence.

Kindly, refer to the following Q & A in its entirety (including related links). 

https://www.al-khoei.org/Questions/sunni-and-shia-marriage-2/

والله العالم‎
(and Allah(awj) Knows best)

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