Commentary:
"
Doubtful day
'' here signifies the day of 30th Sha`ban. In other words, if the moon is not sighted on
29th of Sha`ban because of clouds and a person observes Saum, he will be in doubt whether it is the 30th of Sha`ban
or the 1st of Ramadan. Thus, there is no need to observe Saum on a doubtful day, and one should complete thirty
days of the month of Sha`ban.
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