Because in Friday Prayer a comparatively large number of Muslims gather in a big place, so Islam emphasizes on the physical cleanliness as well. Prophet (SAW) said. "A person who bath on Friday, cleanses himself fully, uses oil and perfume; then goes to the mosjid early in the afternoon takes his place quietly without pushing or disturbing people; then he prays (optional prayer as much as he was able to pray); then sits quietly listening to the Khutbah, he will be forgiven his sins between this Jumah and the next Jumah."(Bukhari)
IMPORTANCE OF GOING EARLY TO FRIDAY PRAYER
On Friday it is more rewarding to get ready quickly to go to the Masjid.
Abu Hurairah (ra) narrated that the Messenger of Allah (SAW) said, "On Friday the Angels stand oust the door of the mosque and write down the names of the people in the order in which they enter the mosque for Friday prayer. The first group of people who enter the mosque get the reward equivalent to that of sacrificing a camel, the people who enter the mosque after them get reward equivalent to that of sacrificing a cow. The people who enter the mosque after them get reward equivalent to that of sacrificing a ram and the people who follow likewise get this reward of a chicken, egg and so on there is a gradation of rewards for the people as they enter. The angels keep writing the names of the people as they enter the mosque until the Imam sits down to give Khutbah. Then the angels collect their registers and sit and listen to the Khutbah."(Bukhari, Muslim)