When does one make up the Witr prayer if one forgets it?
Machine translationRead the Arabic original
The questioner:
He says: Honorable Shaykh, may Allah grant you success, if a person forgets the Witr prayer, when does he make it up?
The Shaykh:
He makes it up between the rising of the sun and the sun reaching its zenith in the sky, or before the Dhuhr prayer. All of this is a time for making up the Witr. However, he must make it an even number if he usually prays Witr with three rak'ahs. If he prays Witr with one rak'ah, he prays two; if he prays Witr with three, he prays four, and so on.
The questioner:
And he asks: Is it permissible for him to make it up after the Adhan for Fajr and before the Fajr prayer?
The Shaykh:
No, making it up is after the sun has risen; because this is what the Prophet (peace and blessings be upon him) did. If he missed the Witr of the night, he would make it up during the day with an even number. Yes.
He says: Honorable Shaykh, may Allah grant you success, if a person forgets the Witr prayer, when does he make it up?
The Shaykh:
He makes it up between the rising of the sun and the sun reaching its zenith in the sky, or before the Dhuhr prayer. All of this is a time for making up the Witr. However, he must make it an even number if he usually prays Witr with three rak'ahs. If he prays Witr with one rak'ah, he prays two; if he prays Witr with three, he prays four, and so on.
The questioner:
And he asks: Is it permissible for him to make it up after the Adhan for Fajr and before the Fajr prayer?
The Shaykh:
No, making it up is after the sun has risen; because this is what the Prophet (peace and blessings be upon him) did. If he missed the Witr of the night, he would make it up during the day with an even number. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [355 -2802] من نسي صلاة الوتر متى يقضيها؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.