The Messenger of Allah ﷺ said, "Jihad is the pillar of Islam and the peak of its summit."
حدثنا أبو المغيرة حدثنا أبو بكر حدثني عطية بن قيس
أن رسول الله ﷺ قال الجهاد عمود الإسلام وذروة سنامه
Its isnad is daif, because of Abu Bakr bin Abu Maryam. The hadith has already appeared as sahih with similar wording at 7850, and will come again with a sahih chain at 21950.