Is it permissible to perform an intracytoplasmic sperm injection (ICSI) procedure again for reproduction four years after the first procedure, which resulted in twin children, especially given the existence of fertilized eggs stored from the first procedure?

It is permissible to conceive through intracytoplasmic sperm injection (ICSI) for those who are unable to conceive by other means, even if they already have children. The permissibility of this procedure is conditional upon there being a need for it and it being the only means of conception after exhausting other methods, while ensuring that lineage is not mixed by using only the husband's sperm and the wife's egg.