Sahih Muslim 6504
صحيح مسلم#6504SahihAbdullah b. 'Amr reported that a person came to Allah's Apostle (ﷺ) and sought permission (to participate) in Jihad, whereupon he (the Holy Prophet) said:Are your parents living? He said: Yes. Thereupon he (the Holy Prophet) said: You should put in your best efforts (in their) service
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 45:5