Al-Sādiqīn Verse (Arabic: آیة الصادقين) (the verse of the truthful), is the title of verse 119 of sura al-Tawba which commands believers to be with "al-sadiqin" (the truthful) and follow them. According to the belief of Shi'a, the "truthful" refers to Ahl al-Bayt (a). This verse is one of Qur'anic proofs for imamate of the twelve Imams (a).
In Shi'a and Sunni hadiths, 'Ali (a), or he and his companions, or he and his sons, or the Prophet Muhammad (s) and Ahl al-Bayt (a) are introduced as the truthful. Many of Shi'a hadiths interpret the truthful as Ahl al-Bayt (a). Al-Shaykh al-Saduq transmitted a hadith from Imam 'Ali (a) which says, "When the al-Sadiqin verse was revealed, someone asked the Prophet (s), "Is the word truthful general or specific?" the Prophet (s) answered, "The ones who are commanded to be with the truthful is general and includes all believers, but the truthful is specific and means my brother 'Ali and other successors of me till the Day of Judgment".