It is narrated about Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he was in one of the gardens of Madinah, teaching his two sons to recite (the Qur'an). Meanwhile two birds - two crows or two doves - passed by him, fluttering. Ibn Mas'ud (may Allah be pleased with him) looked at them and said: By Allah! If these two (sons) were to die, I would grieve for them only as much as I would grieve for these two birds if they fell down dead. And indeed I feel for them what a father feels for his children; but I heard the Messenger of Allah (peace and blessings be upon him) say: "The Hour will not be established until the hypocrites of every tribe become its chiefs." That is why I wish that we die before that time.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9736