“When your parents get old do not say to them even the smallest expression of disrespect. Do not hurt them, or yell at them. Even if they hurt you or even beat you, you should kindly say: May God forgive you and have mercy upon you.
Do not expect too much of them. Do not speak to them in a loud voice. Do not raise your hands above theirs. Do not walk ahead of them.”
Imam Ja’far al-Sadiq (ع) al-Kafi v. 2, p. 157