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.