A worshipper reaches Eid prayer while the imam is in Ruku. There is not enough time to say the extra Takbirs while standing and still catch the imam in Ruku.
In this case:
• say the opening Takbir to enter prayer;
• join the imam in Ruku;
• say the extra Eid Takbirs in Ruku.
These are the extra Takbirs being moved from their standing position, not an opening Takbir omitted altogether. Keep the condition of insufficient time to do both with this example.
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Ada and Qada: The Required Act and Its Substitute
A worshipper reaches Eid prayer while the imam is in Ruku. There is not enough time to say the extra Takbirs while standing and still catch the imam in Ruku.
In this case:
• say the opening Takbir to enter prayer;
• join the imam in Ruku;
• say the extra Eid Takbirs in Ruku.
These are the extra Takbirs being moved from their standing position, not an opening Takbir omitted altogether. Keep the condition of insufficient time to do both with this example.