source: Jeddah is the principal gateway to Mecca, Islam's holiest city, which able-bodied Muslims are required to visit at least once in their lifetime.
target: Muslims are required to visit Mecca once in their lifetime.
references: Muslims are required to visit Mecca once in their lifetime. Able-bodied Muslims are required to visit Mecca, Islam's holiest city, at least once in their lifetime. Jeddah is the way to Mecca, Islam's holiest city, which Muslims who are strong enough must visit at least once a lifetime. Jeddah is the principal gateway to Mecca, Islam's holiest city. Able-bodied Muslims are required to visit Mecca at least once in their lifetime. Jeddah is the gateway to Mecca, Islam's holiest city, which Muslims must visit once in their life. Jeddah is the known way to Mecca, where Muslims are required to visit. Jeddah is the main way to get into Mecca, Islam's holiest city, where able-bodied Muslims are required to visit at least once in their life. Jeddah is the main access point to Mecca. Healthy Muslims are required to visit Mecca at least once in their lifetime. Jeddah is the main gateway to Mecca.  Mecca is Islam's holies city.  Muslims are required to visit Mecca at least once in their life if they are physically capable of doing so. Jeddah is the main gateway to Mecca, Islam's holiest city, which able-bodied Muslims need to visit at least once in their lives.