What is the ruling on one who throws the stones a little before the sun passes its zenith?
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Question : A person stoned the pillars a little before the sun reached its zenith on the second day. Is it permissible for him to stone on the third day on behalf of the second day, or is that sufficient for him?
Answer : It is not permissible to stone before the sun reaches its zenith, even if it is only a little. Accordingly, if a person stoned before the zenith on the second day, which is the eleventh day, he must stone at night. If that is not possible, he stones on the twelfth day. However, he must begin by stoning all three pillars for the eleventh day, then return to the first pillar and stone for the twelfth day.
Answer : It is not permissible to stone before the sun reaches its zenith, even if it is only a little. Accordingly, if a person stoned before the zenith on the second day, which is the eleventh day, he must stone at night. If that is not possible, he stones on the twelfth day. However, he must begin by stoning all three pillars for the eleventh day, then return to the first pillar and stone for the twelfth day.
Source
جلسات الحج 1409هـ - 4 — binothaimeen.net (1:24:07)
The Arabic text is a machine transcription of the audio recording.