Hadith 31-181

وَبِهذَا الإسناد قالَ: قالَ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: مَن قاتَلَنا آخِرَ الزَّمان فَكَأنَّما قاتَلنا مَعَ الدَّجَّالِ.

According to the same documentation, God’s Prophet (S) said, “Whoever fights against us at the end of time, it is as if he has fought against us along with Dajjal (the anti-Christ).”