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Hisn al-Muslim (Fortress of the Muslim) 242
((كَانَ النَّبيُّ صلى الله عليه وسلم إِذَا أَتَاهُ أَمْرٌ يَسُرُّهُ أَوْ يُسَرُّ بِهِ خَرَّ سَاجِداً شُكْراً لِلَّهِ تَبَارَكَ وَتَعَالَى)).
(The Prophet PBUH would prostrate in gratitude to Allah upon receiving news which pleased him or which caused pleasure. )
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 242).