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:18006a –
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السيوطي:١٨٠٠٦a –

"لَوْ يَعْلَمُ صَاحِبُ المَسألَةِ مَا لهُ فِيها لَمْ يَسْألْ".  

[طب] الطبرانى في الكبير [ض] ضياء المقدسي في مختاره عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:12616 – Aḥmad b. Dāwud al-Makkī > Ḥarmalah b. Yaḥyá > Ibn Wahb > Jarīr b. Ḥāzim > Qābūs b. Abū Ẓabyān from his father > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said: "If the questioner knew what he has in it, he wouldn't ask."  

الطبراني:١٢٦١٦ – حَدَّثَنَا أَحْمَدُ بْنُ دَاوُدَ الْمَكِّيُّ ثنا حَرْمَلَةُ بْنُ يَحْيَى ثنا ابْنُ وَهْبٍ ثنا جَرِيرُ بْنُ حَازِمٍ عَنْ قَابُوسَ بْنِ أَبِي ظَبْيَانَ عَنْ أَبِيهِ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «لَوْ يَعْلَمُ صَاحِبُ الْمَسْأَلَةِ مَا لَهُ فِيهَا لَمْ يَسْأَلْ»