A man prayed the midday prayer for two units while forgetting, then said the closing salam. Does he stand up, say the opening takbir, and pray the two units that are due on him?
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The questioner:
If the one praying says the salam after two units of a four-unit prayer while forgetting,
The Shaykh:
Yes.
The questioner:
and he remembers and wants to complete it, does he begin the two units with the takbir of entering prayer?
The Shaykh:
No, it is not permissible to add [a takbir]. The takbir he said when standing up from prostration is the takbir of transition; he is sufficient with it. He returns, faces the qiblah, and enters the prayer without a takbir; the takbir he said when standing up from prostration is sufficient. Also, if he is returning, he sits and then stands up. He returns, sits facing the qiblah, then stands up and completes his prayer.
If the one praying says the salam after two units of a four-unit prayer while forgetting,
The Shaykh:
Yes.
The questioner:
and he remembers and wants to complete it, does he begin the two units with the takbir of entering prayer?
The Shaykh:
No, it is not permissible to add [a takbir]. The takbir he said when standing up from prostration is the takbir of transition; he is sufficient with it. He returns, faces the qiblah, and enters the prayer without a takbir; the takbir he said when standing up from prostration is sufficient. Also, if he is returning, he sits and then stands up. He returns, sits facing the qiblah, then stands up and completes his prayer.
Source
قناة «العلامة الدكتور صالح الفوزان»، [657 -3022] رجل صلى الظهر ركعتين ناسيا فسلم، فهل يقوم ويكبر تكبيرة الإحرام ويصلي الركعتين التي عليه؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.