Sayyidina Saad (RA) narrated: Four verses were revealed about me. Then he narrated the account. His mother, Umm Sa’d, asked him, “Has not Allah commanded you to be pious? By Allah, I will neither eat food nor drink water till I die or you come back to Christianity.” So, when they decided to feed her, then opened her mouth and fed her. Then this verse was revealed:
And we have enjoined on man kindness to his parents, but if they strive (to compel) you to associate with Me.
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(29:8 to the and)
[Ahmed 1567, Muslim 1748, Abu Dawud 2740]