Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:23863a
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السيوطي:٢٣٨٦٣a

"نِعْمَ الشَّيءُ الفألُ، الْكَلِمَةُ الْحَسنةُ يَسْمَعُها أَحَدُكُمْ".  

الديلمي عن أبي هريرة

See similar narrations below:

Collected by Ibn Ḥibbān
ibnhibban:6125ʿAbd

I heard Messenger of Allah ﷺ as saying: There is no divination but the best type is the good omen. It was said to Messenger of Allah ﷺ: What is good omen? Thereupon he said: A good word which one of you hears. (Using translation from Muslim 2223a)   

ابن حبّان:٦١٢٥أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ أَحْمَدَ بْنِ مُوسَى بِعَسْكَرِ مُكْرَمٍ وَكَانَ عَسِرًا نَكِدًا قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدِ بْنِ حِسَابٍ قَالَ حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ عَنْ مَعْمَرٍ عَنِ الزُّهْرِيِّ عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «لَا طِيَرَةَ وَخَيْرُ الْفَأْلِ الْكَلِمَةُ الصَّالِحَةُ يَسْمَعُهَا أَحَدُكُمْ»