It was reported in some authentic narrations of the Ahlulbait (peace be upon them) the emphasis on crying, showing sadness and grief for Imam Hussain (peace be upon him) and establishing the mourning ceremonies for his tragedy and refraining from eating or drinking on the day of Ashura - without the intention of fasting - and breaking it with little water and food after noon. It was reported also to refrain from going out for regular needs on such occasions. It was also reported that whoever goes out to fulfill one of his needs that day, Almighty Allah will not bless it if it was fulfilled. It was also reported the emphasis on presenting grief and sadness for the tragedies of the Ahlulbait in general and there is no doubt that the days of their martyrdoms are the best to do so. From such narrations, one can determine under what category the mentioned examples fit, since some of them are inconsistent with sadness and grief, while others are not.
It is not permissible for him to present himself to lead the congregational prayer if he knows that he does not fulfil the requirements of the Imam of the prayer, in such a way he would be considered as cheating them.If they asked him to lead the prayer, it is permissible to do so, although it is better not to in this particular case as well. If he was praying alone and someone decided to pray behind him in congregation, then his prayer is in order and he has not committed a sin. If he was not qualified to lead the prayer, he should not apply the laws of the congregational prayer on him, for example, referring to the people praying behind him when he has doubts.
There is no doubt that prophet Jesus (peace be upon him) did not die in the way death comes to people, by the soul leaving the body. What is apparent in this verse is that he was raised with his body to the heavens.