((اللَّهُمَّ لاَ طَيْرَ إِلاَّ طَيْرُكَ، وَلاَ خَيْرَ إِلاَّ خَيْرُكَ، وَلاَ إِلَهَ غَيْرُكَ)).
(This supplication is used whenever one initially thinks a casual event or occurrence to foretell good or evil, using it as a basis to determine which action he should undertake, but he then denounces such a link, relies on Allah and then says this supplication as an expiation for this act, since it falls under the category of shirk.)(O Allah, there is no omen but there is reliance on You, there is no good except Your good and none has the right to be worshipped except You.)
Ahmad 2/220, Ibn As-Sunni (no. 292). See also Al-Albani, Silsilatul-'Ahadlth As-Sahihah 3/54, (no. 1065). As for bodings of good, these used to please the Prophet (ﷺ) and so when he heard good words from someone, he used to say: "We have taken from you a good portent from your mouth," Abu Dawud, Ahmad. See also Al-Albani, Silsilatul-'Ahadith As-Sahihah 2/363, and it is with Abu Ash-Shaikh Al-Asfahani in 'Akhlaqun-Nabiyy, pg. 270.