It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) used to supplicate: "O Allah! I seek refuge in You from being overcome by debt and from being overpowered by the enemy, and from (the harm of) a widow remaining unmarried, and from the trial of the Dajjal."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11832