Musannaf Ibn Abi Shayba 28:1131

Zayd ibn al-Hubab narrated to us, he said: Raja’ ibn Abi Salamah narrated to me, he said: Mughirah ibn Habib, the son-in-law of Malik ibn Dinar, narrated to me, he said: I asked Ibn ‘Abd Allah, and I said: "We enter the land of polytheism and besiege a fortress, and they fight us a fierce fight, then they ask us for safety, but the commander refuses that. So what is your opinion regarding fighting them?" He said: "That is not up to you; it is up to the commander."