Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

"These have power to shut heaven, that it rain not in the days of their prophecy."[29] This means that they would rule supreme in that age. In other words, the law and teachings of Muhammad, and the exposition and commentaries of 'Alí, are a heavenly grace. Should they wish to bestow this grace, it is in their power to do so, and should they wish otherwise, no rain will fall, and by "rain" is meant here the outpouring grace. (11:16) com1

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