Abu Hurairah (May Allah be pleased with him) reported:
A person came to Messenger of Allah (ﷺ) and asked, “Who among people is most deserving of my fine treatment?” He (ﷺ) said, “Your mother”. He again asked, ”Who next?” “Your mother”, the Prophet (ﷺ) replied again. He asked, “Who next?” He (the Prophet (ﷺ)) said again, “Your mother.” He again asked, “Then who?” Thereupon he (ﷺ) said,” Then your father.”
In another narration: “O Messenger of Allah! Who is most deserving of my fine treatment?” He (ﷺ) said, “Your mother, then your mother, then your mother, then your father, then your nearest, then nearest”.
[Al-Bukhari and Muslim].