I decided to read ziyarat e ashura for 40 days so my wish can be fulfilled, right after 5 days the wish came true. I kept reading ziyarat e ashura to keep up the 40 days. However, yesterday i missed reading it, do you think i need to do 40 days all over again or can i give sadqa and finish it altogether?

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If you did not say Wallah you will read it for 40 days you do not need to continue the reading as it is not Wajib. It was just a promise you made and it’s ok to break it as long as not bringing the name of God. It is recommended to complete the 40, even if you missed a day you can continue until you reach 40. Or you can read it twice in one day to catch up.