Sahih Muslim 14020
In-book no 6743حَدَّثَنَا أَبُو كُرَيْبٍ، مُحَمَّدُ بْنُ الْعَلاَءِ حَدَّثَنَا ابْنُ إِدْرِيسَ، قَالَ سَمِعْتُ عَاصِمَ بْنَ كُلَيْبٍ، عَنْ أَبِي بُرْدَةَ، عَنْ عَلِيٍّ، قَالَ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " قُلِ اللَّهُمَّ اهْدِنِي وَسَدِّدْنِي وَاذْكُرْ بِالْهُدَى هِدَايَتَكَ الطَّرِيقَ وَالسَّدَادِ سَدَادَ السَّهْمِ " .
'Ali reported that Allah's Messenger (ﷺ) said to him: Say," O Allah, direct me to the right path and make me adhere to the straight path," and when you make a mention of right guidance, keep in mind the right path and when you consider of the straight (path), keep in mind the straightness of the arrow.