ENOfficial
‘Abd ar-Rahman b. Samura told that God’s Messenger said to him, “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.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَبْدِ الرَّحْمَنِ بْنِ سَمُرَةَ قَالَ: قَالَ لِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تَسْأَلِ الْإِمَارَةَ فَإِنَّكَ إِنْ أُعْطِيتَهَا عَنْ مَسْأَلَةٍ وُكِلْتَ إِلَيْهَا وَإِنْ أُعْطِيتَهَا عنْ غيرِ مَسْأَلَة أعنت عَلَيْهَا»
sunnah.com