Answering Ansar says:
Answer:
Dreams are something else from reality. The person was not doing an act in reality, but he saw in a dream. The things that you do in dream are not your acts, and the person himself knew it is wrong and he himself tried to stop him. The thing is, dreams have their interpretations.
Than he woke up, still he was doing it involuntarily, and he knew very well that it is wrong, on such actions which are done unintentionally, e.g if a man takes the goods of the other by mistake, it is called a mistake, not theft, here also, it was purely unintentional, and the text shows that he knew very well that it is wrong, hence neither does it becomes the kalimah , nor can such a person be called a kafir. Otherwise, if a person says any kufriya word involuntarily, can we call him kafir? Concerning vows, we read in the Holy Quran
“Allaah will not punish you for what is unintentional in your oaths, but He will punish you for your deliberate oaths” [al-Maa’idah 5:89]
Similarly , the Prophet (S) said:
“Allah does not hold my umma (community) responsible for the things that they do by mistake, by forgetting and under compulsion.” (Ibn Majah, Talaq, 16).
Similarly, we read in Sahih Bukhari ,Volume 1, Book 1, Number 1:
Narrated ‘Umar bin Al-Khattab:
I heard Allah’s Apostle saying, “The reward of deeds depends upon the intentions and every person will get the reward according to what he has intended …
Similarly, Murtaza Mutahhiri, an esteemed Shia scholar says:
“If you do something unintentionally you are not guilty if it is something bad and if it is something good you do not deserve any reward.”
http://www.al-islam.org/al-tawhid/ashura/4.htm
Similarly, a tradition of Imam Baqir is present in the Shiite website , al-islam.org
“In another tradition, Zurarah asked the same Imam about the attitude of a master towards the slaves. The Imam answered that “an act unintentionally done by the slaves is not punishable but when they are persistently and intentionally disobeying the will of the master, then they can be punished.”
http://www.al-islam.org/slavery/3.htm
So such a person can’t be called a kafir. These words are surely kufriya words, but he was saying unintentionally.
Now, lets see a dream of a woman and its interpretation by the Prophet (peace be upon him)
Umme fadhal saw a dream that a body part of the Prophet (peace be upon him) was cut and placed in her lap. She was very frightened, and she ran towards the Prophet (peace be upon him) and told him that she saw a very horrific dream. The Prophet (peace be upon him) after listening smiled and sad that it is a very good dream. O Umm Fadhal, its interpretation is that my daughter, Fatima will have a son, and you will upbring him. Than Imam Hussain (may Allah be pleased with him) was born soon after this incident.
Shia Book:
Choda Sitarey , Page 212
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Answering-Ansar Unveiled 