Authentic
graded by Al-Albani
Mishkat al-Masabih 6085
Narrator:Abdullāh ibn ‘Umar
عَن ابْن عمر قَالَ: كُنَّا نَقُولُ وَرَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ حَيٌّ: أَبُو بَكْرٍ وَعُمَرُ وَعُثْمَانُ رَضِي الله عَنْهُم. رَوَاهُ التِّرْمِذِيّ
Ibn `Umar said:
When God's messenger was alive, we used to say, "Abu Bakr, `Umar and `Uthman, God be pleased with them!" Tirmidhi transmitted it.
Cited in Mishkat al-Masabih (No. 6085).