Day Questions

If I go to a mosque or a shrine of an Imam and find a scholar whom I do not know leading prayers in front of a very large group of people, none of whom I know, is it permissible for me to pray with them in congregation? Or is it necessary for me to first get to know the scholar, spend time with him and so on to ascertain that he is adil?

The Adalah of the imam must be considered before one offers congregational prayer. It can be determined by knowledge and certainty that originates from dealing with him or from other ways of reaching such knowledge, testimony of two Adil witnesses and by good apparent behavior. Having a big crowd that offer the prayer behind a person is not sufficient.

Is the iddah period obligatory on a woman who used birth control pills during her previous marriage?

If the marriage was consummated then observing ʿiddah is obligatory in all cases.