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:22325a –
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السيوطي:٢٢٣٢٥a –

"مَنْ عَمَّرَ جَانبَ الْمَسْجدِ الأَيسَر لِقِلَّةِ أَهْلِهِ فَلَهُ أَجْرَان".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:11459 – Muḥammad b. al-Ḥasan b. ʿAjlān Abū Shaykh al-Aṣbahānī > Ibrāhīm b. Muḥammad al-Firyābī > Ādam b. Abū Iyās > Baqiyyah b. al-Walīd > Ibn Jurayj > ʿAṭāʾ > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Whoever builds the left side of the mosque for the scarcity of its people, he will have two rewards."  

الطبراني:١١٤٥٩ – حَدَّثَنَا مُحَمَّدُ بْنُ الْحَسَنِ بْنِ عَجْلَانَ أَبُو شَيْخٍ الْأَصْبَهَانِيُّ ثنا إِبْرَاهِيمُ بْنُ مُحَمَّدٍ الْفِرْيَابِيُّ ثنا آدَمُ بْنُ أَبِي إِيَاسٍ ثنا بَقِيَّةُ بْنُ الْوَلِيدِ عَنِ ابْنِ جُرَيْجٍ عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ عَمَّرَ جَانِبَ الْمَسْجِدِ الْأَيْسَرَ لِقِلَّةِ أَهْلِهِ فَلَهُ أَجْرَانِ»