The Prophet (ﷺ) said, " Let the slave of Dinar and
Dirham, of Quantify and Khamisa perish as he is pleased if these
things are given to him, and if not, he is displeased. Let such a
person perish and relapse, and if he is pierced with a thorn, let him
not find anyone to take it out for him. Paradise is for him who holds
the reins of his horse to strive in Allah's Cause, with his hair
unkempt and feet covered with dust: if he is appointed in the
vanguard, he is perfectly satisfied with his post of guarding, and if
he is appointed in the rearward, he accepts his post with
satisfaction; (he is so simple and unambiguous that) if he asks for
permission he is not permitted, and if he intercedes, his intercession
is not accepted."
Sahih al-Bukhari Book 56, Hadith 102