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‘A’isha reported the Prophet (ﷺ) as saying, “He who develops land which has no owner has the best right to it.” ‘Urwa said that ‘Umar gave decision accordingly during his caliphate. Bukhari transmitted it.
Source: sunnah.com
Other translations
Arabic
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ عَمَرَ أَرْضًا لَيْسَتْ لِأَحَدٍ فَهُوَ أَحَقُّ» . قَالَ عُرْوَةُ: قَضَى بِهِ عُمَرُ فِي خِلَافَتِهِ. رَوَاهُ الْبُخَارِيُّ
sunnah.com