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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
tirmidhi:486 – Abū Dāwud Sulaymān b. Salm al-Maṣāḥifī al-Balkhī > al-Naḍr b. Shumayl > Abū Qurrah al-Asadī > Saʿīd b. al-Musayyab > ʿUmar b. al-Khaṭṭāb

"Indeed the supplication stops between the heavens and the earth. Nothing of it is raised up until you send Salat upon your Prophet."  

الترمذي:٤٨٦ – حَدَّثَنَا أَبُو دَاوُدَ سُلَيْمَانُ بْنُ سَلْمٍ الْمَصَاحِفِيُّ الْبَلْخِيُّ أَخْبَرَنَا النَّضْرُ بْنُ شُمَيْلٍ عَنْ أَبِي قُرَّةَ الأَسَدِيِّ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ عَنْ عُمَرَ بْنِ الْخَطَّابِ قَالَ

إِنَّ الدُّعَاءَ مَوْقُوفٌ بَيْنَ السَّمَاءِ وَالأَرْضِ لاَ يَصْعَدُ مِنْهُ شَيْءٌ حَتَّى تُصَلِّيَ عَلَى نَبِيِّكَ ﷺ  

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Collected by Suyūṭī
suyuti:2-302b – ʿUmar > Dhukir Liá
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السيوطي:٢-٣٠٢b –

"عَنْ عُمَرَ قَالَ: ذُكِرَ لِى أنَّ الدُّعَاءَ يَكُونُ بَيْنَ السَّمَاءِ وَالأَرْضِ لَا يَصْعَدُ مِنْهُ شَئٌ حَتَّى يُصَلَّى عَلَى النَّبِىِّ ﷺ ".  

ابن راهويه بسند صحيح