Hadith 31-218

وَبِهذَا الإِسناد قالَ: قالَ رَسُولَ اللَّهِ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: أَنْتَ يا عَلِيُّ وَوَلَداكَ خِيرَةُ اللَّهِ مِن خَلقِهُ.

According to the same documentation, God’s Prophet (S) said, “O Ali! You and your two sons are from the best of the chosen creatures of God.”