What did Muhammad say that every Muslim should do in his lifetime, if he is able?

Pilgrimage to Mecca

Explanation:

For Muslims , Mecca is considered  as the first house of Worship of Allah which built by prophet Abraham and Ishmael (his son). Typically, Muslims who managed to complete this pilgrimage will be celebrated by the time they get back to their community. It's a very important achievement for every Muslims in the world.

On average, more than 2 million Muslims from all over the world come to Saudi Arabia to complete this Pilgrimage.

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.