Is a purchase valid if a third party pays the price for a slave without the buyer's instruction?

Chapter on Selling the Musarrah (Animal with milk retained in udder)

Al-Mughni

Book of Sales

Book 12 · Issue 1 · Bab 5

Open in Qurani

Primary text

The purchase of a slave for one hundred (Dirhams/currency) is valid even if another person pays that amount on the buyer's behalf, regardless of whether this payment was made with the buyer's authorization or without it.