The Lord teaches us here about one of our primary purposes as His saints, to care for the poor and the needy. And then He teaches us about what true sacrifice is.
Uchtdorf
https://www.churchofjesuschrist.org/study/general-conference/2019/10/43uchtdorf?lang=eng
Davies
https://www.churchofjesuschrist.org/study/general-conference/2014/10/the-law-of-the-fast-a-personal-responsibility-to-care-for-the-poor-and-needy?lang=eng
Maxwell
https://www.churchofjesuschrist.org/study/general-conference/1995/04/deny-yourselves-of-all-ungodliness?lang=eng