Muslims should go to the mosque day and night and should love being there. `Abdullah ibn Mas`ud said: “No one should miss the Prayer at the mosque except the ill and the hypocrites.” He also added that the Prophet (peace and blessings be upon him) taught us the means to guidance and one of these means is praying at the mosque. It is more preferable to go to the mosque early especially on Friday.
Sheikh Sayyed Sabiq states in his well-known book, Fiqh Us-Sunnah states that: At-Tirmidhi reports that the people of knowledge dislike that one should step over the necks of the people during Jumu`ah Prayer and they were very strict about this. `Abdullah ibn Busr says: “A man came, and he was stepping over the necks of the people while the Prophet (peace and blessings be upon him) was delivering the khutbah of Jumu`ah. He (the Prophet) said to him: ‘Sit down. You have harmed the people and have come late.’” (Abu Dawud, An-Nasa’i, Ahmad, and Ibn Khuzaimah)
This ruling does not apply to the imam or one who finds a space and cannot reach it, except by stepping over the people. If one wants to return to his place after leaving it due to some necessity, he may do so on the condition that he does not harm the people. `Uqbah ibn al-Harith relates: “I prayed the `Asr in Madinah behind the Prophet and then he stood and hurried off, stepping over the people to go to some of the apartments of his wives. The people were afraid because he was rushing in this manner. When he came out and found them amazed at leaving them in such a hurry, he said: “I remembered some gold that was in my possession and I hated that it should remain with me, so I ordered it to be distributed.’” (Al-Bukhari and An-Nasa’i)