Conditions of the six imams

The six imams intended are Al -Bukhari, Muslim, Abu Dawood, Al -Tirmidhi, Al -Nasa''i and Ibn Majah, and each of them has his book in collecting the hadiths of the Messenger of God, but each of them has a curriculum in choosing hadiths in terms of strength (health) and weakness, and this approach is what Al -Maqdisi showed in this message,