كَانَ النَّبِيُّ ﷺ إذَا أتَاهُ أَمْرٌ يَسُرُّهُ أَوْ يُسَرُّ بِهِ؛ خَرَّ سَاجِداً شُكْراً لله تَبَارَكَ وَ تَعَالَى

The Prophet \pbuh would prostrate in gratitude to Allāh upon receiving news which pleased him or which caused pleasure.

Reference: The Prophet \pbuh would prostrate in gratitude to Allāh upon receiving news which pleased him or which caused pleasure. Abū Dāwud (#2774), al-Tirmidhī (#1578) and Ibn Mājah (#1394). Also see _Ṣaḥīḥ Ibn Mājah_ (1/233) and _Irwāʾ al-Ghalīl_ (2/226).