‘Alqamah ibn Qays (rahimahullah) summed it up in his final advice to his son

Allah Ta'ala said,
"… And do not obey one whose heart We have made heedless of Our
remembrance and who follows his desire and whose affair is ever [in]
neglect." [al-Kahf: 28]
As for good character, then 'Alqamah ibn Qays (rahimahullah) summed it
up in his final advice to his son as he was on his deathbed:
"O my son, if you ever feel the need to befriend and accompany men,
then accompany the one who protects you when you help him, adorns you
if you walk with him, and supplies you when your provisions run out.
Accompany the one who when you stretch forth your hands in goodness ,
he stretches his hand too, ifhe sees merit from you, he remembers it,
and if he sees bad from you, he remedies it. Accompany the one who
gives you when you ask , who steps up when you are silent, and who
consoles you when calamity overtakes you. Accompany the one who
believes you when you speak , entrusts you when you engage in work ,
and if you fall out, he prefers you to the fallout."
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