Hazrat Ali (may Allah be pleased with him) said that one must come for Jumu'ah, even if one has to come crawling on one's knees.

Hazrat Maymun bin Abi Shabib says that during the time of Hajjaj bin Yusuf, I intended to go for Friday prayer and also made preparations. Then I thought in my heart, "Why should I pray behind him?" Sometimes I would think to go, and sometimes I would think not to go. Eventually, my final decision was to go for the prayer. At that moment, I heard a caller from the direction of the Ka'bah say: "O you who believe! When the call for prayer is made on Friday, hasten to the remembrance of Allah and leave off trade." In the same way, once I sat down to write a letter and a thought came to my mind which was contrary to the truth, but by writing it, my letter would become more adorned. Sometimes I would think to embellish the letter with a lie, and sometimes I would think to leave it and keep the letter based on truth. In any case, my decision was to leave it. Upon this, I heard a caller from the direction of the Ka'bah say: "Allah keeps the believers firm with the firm word in this world and in the Hereafter."

Hazrat Abu Sinan says that during the time of Mukhtar, the subject of Friday prayer was mentioned, so Hazrat Abdullah bin Abi Hazil said that come for the Friday prayer even if the water reaches the pebbles.