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
abudawud:2330 – Sulaymān b. ʿAbd al-Raḥman al-Dimashqī Fī Hadhā al-Ḥadīth > al-Walīd

I heard Abu 'Amr al-Auza'i say: The word sirrahu means beginning of the month.  

أبو داود:٢٣٣٠ – حَدَّثَنَا سُلَيْمَانُ بْنُ عَبْدِ الرَّحْمَنِ الدِّمَشْقِيُّ فِي هَذَا الْحَدِيثِ قَالَ قَالَ الْوَلِيدُ

سَمِعْتُ أَبَا عَمْرٍو يَعْنِي الأَوْزَاعِيَّ يَقُولُ سِرُّهُ أَوَّلُهُ