Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:2882a –

The Prophet ﷺ said: The gates of heaven are opened for four rak'ahs containing no taslim (salutation) before the noon prayer. Abu Dawud said: Yahya b. Sa'id al-Qattan said: If I were to narrate any tradition from 'Ubaidah, I would narrate this tradition. Abu Dawud said: 'Ubaidah is weak. Abu Dawud said: The name of the narrator Ibn Minjab is Sahm. (Using translation from Abū Dāʾūd 1270)   

السيوطي:٢٨٨٢a –

"أَربَعُ قبْلَ الظهرِ ليسَ فيهن تسليم تُفتح لهُن أبواب السماء ".  

[د] أبو داود [ت] الترمذي في الشمائل، وابن جرير، [هـ] ابن ماجة وابن خزيمة عن أبي أيوب

See similar narrations below:

Collected by Abū Dāwūd
abudawud:1270 – Ibn al-Muthanná > Muḥammad b. Jaʿfar > Shuʿbah > ʿUbaydah > Ibrāhīm > Ibn Minjāb > Qarthaʿ > Abū Ayyūb

The Prophet ﷺ said: The gates of heaven are opened for four rak'ahs containing no taslim (salutation) before the noon prayer. Abu Dawud said: Yahya b. Sa'id al-Qattan said: If I were to narrate any tradition from 'Ubaidah, I would narrate this tradition. Abu Dawud said: 'Ubaidah is weak. Abu Dawud said: The name of the narrator Ibn Minjab is Sahm.  

أبو داود:١٢٧٠ – حَدَّثَنَا ابْنُ الْمُثَنَّى حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ قَالَ سَمِعْتُ عُبَيْدَةَ يُحَدِّثُ عَنْ إِبْرَاهِيمَ عَنِ ابْنِ مِنْجَابٍ عَنْ قَرْثَعٍ عَنْ أَبِي أَيُّوبَ

عَنِ النَّبِيِّ ﷺ قَالَ أَرْبَعٌ قَبْلَ الظُّهْرِ لَيْسَ فِيهِنَّ تَسْلِيمٌ تُفْتَحُ لَهُنَّ أَبْوَابُ السَّمَاءِ  

قَالَ أَبُو دَاوُدَ بَلَغَنِي عَنْ يَحْيَى بْنِ سَعِيدٍ الْقَطَّانِ قَالَ لَوْ حَدَّثْتُ عَنْ عُبَيْدَةَ بِشَىْءٍ لَحَدَّثْتُ عَنْهُ بِهَذَا الْحَدِيثِ قَالَ أَبُو دَاوُدَ عُبَيْدَةُ ضَعِيفٌ قَالَ أَبُو دَاوُدَ ابْنُ مِنْجَابٍ هُوَ سَهْمٌ