Uqba bin Amir reported,

The Messenger of Allah ﷺ said, "The conditions most deserving to be fulfilled are those by which you make intimate relations lawful."

Azami 6503

Sahih

عن عقبة بن عامر قال

قال رسول الله ﷺ: أحق الشروط أن توفوا بها ما استحللتم به الفروج.

الأعظمي 6503صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Marriage
Chapter
Bridal gift
Section
Obligation of the dowry, that there is no limit for its maximum or minimum, and its permissibility in exchange for teaching the Quran
Numbering
Jami al-Kamil 6503 (2nd edition)
Azami 6503