The above mentioned Hadith has a Shahid (supporting narration) which is weak, reported by Ahmad from Abu Hurayrah (radiyallahu anhu).
وَلَهُ شَاهِدٌ ضَعِيفٌ عَنْ أَبِي هُرَيْرَةَ عِنْدَ أَحْمَدَ
The above mentioned Hadith has a Shahid (supporting narration) which is weak, reported by Ahmad from Abu Hurayrah (radiyallahu anhu).
ضعيف أيضا. وهو عند أحمد (2/443)، ولفظه: «من لم يوتر فليس منا»
Who passed it on, from Ibn Hajar back to the one who was there.
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