When something happened that pleased him, the Prophet (ﷺ) used to say: Alḥamdu lillāhi ‘lladhi bi ni`matihi tatimmuṣ-ṣāliḥāt. And if something happened that displeased him, he used to say: Alḥamdu lillāhi `alā kulli ḥāl. When something happened that pleased him, the Prophet (ﷺ) used to say: Praise is to Allah Who by His blessings all good things are perfected. And if something happened that displeased him, he used to say: Praise is to Allah in all circumstances. Reference: Ibn As-Sunni, 'Amalul-Yawm wal-Laylah, and Al-Hakim who graded it authentic 1/499. See also Al-Albani, Sahihul-Jami' As-Saghir 4/201.