ANSWER:

You must not pray behind a person who wears taweez, amulets and charms. 

Most people put on amulets, charms or taweez and also use metals like watches but are not watches they are actually charms, so if I pray behind such people when he is leading the prayer, is my prayer valid?

Prayer | January 8, 2018 1:48 am
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I usually pray witr after isha prayers and wake up around 3am and pray tahajjud and later fajr. But a friend said that witr should be prayed after tahajjud since it should be the last prayer of the day. What’s the correct opinion on this? Im confused because i thought tahajjud was supposed to be considered the next day