It was narrated that Sa`d bin Waqqas said:
"Mu`awiyah came on one of his pilgrimages and Sa`d entered upon him. They mentioned `Ali, and Mu`awiyah criticized him. Sa`d became angry and said: 'Are you saying this of a man of whom I heard the Messenger of Allah (ﷺ) say: "If I am a person's close friend, `Ali is also his close friend." And I heard him say: "You are to me like Harun was to Musa, except that there will be no Prophet after me." And I heard him say: "I will give the banner today to a man who loves Allah and His Messenger."
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا مُوسَى بْنُ مُسْلِمٍ، عَنِ ابْنِ سَابِطٍ، - وَهُوَ عَبْدُ الرَّحْمَنِ - عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ، قَالَ قَدِمَ مُعَاوِيَةُ فِي بَعْضِ حَجَّاتِهِ فَدَخَلَ عَلَيْهِ سَعْدٌ فَذَكَرُوا عَلِيًّا فَنَالَ مِنْهُ فَغَضِبَ سَعْدٌ وَقَالَ تَقُولُ هَذَا لِرَجُلٍ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ ‏"‏ مَنْ كُنْتُ مَوْلاَهُ فَعَلِيٌّ مَوْلاَهُ ‏"‏ ‏.‏ وَسَمِعْتُهُ يَقُولُ ‏"‏ أَنْتَ مِنِّي بِمَنْزِلَةِ هَارُونَ مِنْ مُوسَى إِلاَّ أَنَّهُ لاَ نَبِيَّ بَعْدِي ‏"‏ ‏.‏ وَسَمِعْتُهُ يَقُولُ ‏"‏ لأُعْطِيَنَّ الرَّايَةَ الْيَوْمَ رَجُلاً يُحِبُّ اللَّهَ وَرَسُولَهُ ‏"‏ ‏.‏
GradeSahih (Darussalam)
English reference : Vol. 1, Book 1, Hadith 121
Arabic reference : Book 1, Hadith 126