"'Ali said: 'I am the slave of Allah and the brother of His Messenger. I am the greatest teller of the truth (Siddiq Akbar), and no one will say this after me except a liar. I prayed seven years before the people." (Using translation from Ibn Mājah 120)
قَالَ عَلِيٌّ «أَنَا عَبْدُ اللهِ وَأَخُو رَسُولِهِ ﷺ وَأَنَا الصِّدِّيقُ الْأَكْبَرُ لَا يَقُولُهَا بَعْدِي إِلَّا كَاذِبٌ صَلَّيْتُ قَبْلَ النَّاسِ بِسَبْعِ سِنِينَ»