Sunan Abu Dawud
2929
Sahih+2

Narrated 'Abd al-Rahman b. Samurah:The Messenger of Allah (ﷺ) said to me: 'Abdul al-Rahman b. Samurah, do not ask for the position of commander, for if you are given it after asking you will be left to discharge it yourself, but if you are given it without asking you will be helped to discharge it

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid