Is it permissible to offer mandatory prayer while sitting?
All perfect praise be to Allah, The Lord of The Worlds, and may His Peace and Blessings be upon our Prophet Muhammad and upon all of his family and companions. Standing up is a pillar in the mandatory prayer and the prayer is not valid without it unless one cannot do it. As for Nafila (supererogatory prayer), one can perform it in the state of sitting even if he/she can stand, but his/her reward is half the reward of the person who prays while standing if he/sh has no legal excuse for such an act. And Allah Knows Best.
Is it permissible to offer prayer at home, or should it be offered in the mosque?
All perfect praise be to Allah, The Lord of The Worlds. It isn`t preferable for the man to pray at home as praying in the mosque is twenty seven times more rewarding. Therefore, this should motivate him to offer prayers in the mosque. And Allah Knows Best.
I wish to purchase an online account (a gaming account), and its ownership will be transferred to me. However, my friend will purchase it on my behalf, and I will repay him in deferred installments with an added profit margin to account for the installment sale. What is the ruling of Islamic Law on this transaction?
All praise is due to Allah, and peace and blessings be upon our master, the Messenger of Allah.
The ruling on selling electronic games depends on the ruling of the game itself: if the game is permissible, then selling it is likewise permissible. However, if the game contains Sharia violations that render playing it impermissible, then selling it in that case is neither valid nor permissible. Therefore, we advise the necessity of reviewing the Sharia guidelines for electronic games set forth in Fatwa No. (3369).
Accordingly, if the game is permissible, a person may purchase it, take legal possession of it, and subsequently sell it in deferred installments for a price higher than its purchase price. The General Iftaa' Department has permitted dealing through Murabaha, while emphasizing the necessity of observing the Sharia conditions required for this transaction; please refer to Fatwa No. (2861). And Allah Almighty knows best.
What is the ruling on vomiting, and does it invalidate ablution?
Vomit is impure (najis). Its exit is not considered one of the nullifiers of ablution. However, the mouth must be washed and purified from it, and any that gets on clothing or the body must be washed for prayer, because prayer is not valid with impurity present on the body or clothing. And Allah the Almighty knows best.