I am looking for Meforshim In Sefer Shmos parshas shmos in perek daled that discuss the inyan of Aharon Having a Lev Tov and not bieng jelous of his younger brother
There are many English sefarim on Parshas Sh’mos that surely deal with that topic.You can also connect to Pirkei Avos which teaches us that having a “layv tov” is above all,the finest way for a Jew to live,according to some.It also discusses jealousy.