Sayyiduna Imran bin Husayn (may Allah be pleased with him) relates that the Prophet (peace and blessings be upon him) forbade selling weapons during times of civil strife (fitnah).
Al-Bazzar recorded it; its chain contains Bahr bin Kunayz al-Saqqa', who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12264