It is narrated from Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him), who said: Part of honoring Allah is to show respect and reverence to an elderly Muslim, to honor the carrier of the Qur'an who neither exaggerates nor neglects it, and to honor a just ruler.
Hadith Referenceالادب المفرد / كتاب الأكابر / 357
Hadith Gradingالألبانی:حسن
Hadith Takhrij«حسن : أخرجه أبوداؤد مرفوعًا ، كتاب الأدب ، باب فى تنزيل الناس منازلهم : 4843 - انظر صحيح الترغيب : 98»
It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "He is not one of us who does not show mercy to our young ones and does not respect the honor and dignity of our elders, that is, of a Muslim."