Riyad as-Salihin

Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "One who weeps out of fear of Allah, will not enter the Hell till milk returns back in the udder; and the dust raised on account of fighting in the path of Allah and the smoke of Hell will never exist together".

[At- Tirmidhi, who classified it as Hadith Hasan Sahih].