Abu Dawud said: Malik was asked about the meaning of his saying: There is no safar. He replied: The people of pre-Islamic Arabia used to make the month of safar lawful (for war). They made it lawful in one year and unlawful in another year. The Prophet ﷺ said: There is no safar.
Hadith Referenceسنن ابي داود / كتاب الكهانة والتطير / 3914
Hadith Gradingالألبانی:صحيح مقطوع | زبیر علی زئی:إسناده صحيح