What is the longest ayat in the quran?

The longest ayat in the Quran is Ayat al-Kursi, which is located in Surah Baqarah, verse 255. It is also known as the Throne Verse and is considered one of the most significant verses in the Quran.

Ayat al-Kursi is 286 words long, comprising of nearly four lines, and contains the essence of the belief in Allah's supremacy and the importance of His protection. It emphasizes the greatness and sovereignty of Allah and describes Him as the protector of all creation.

Muslims believe that reciting Ayat al-Kursi after every prayer and before sleeping, helps protect them against evil and grants them a sense of peace and security. It is also believed to be a means of achieving forgiveness and blessings from Allah.