Three sentences with the same opening
The third one is about saying nothing.
مَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ فَلْيُكْرِمْ جَارَهُ، وَمَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ فَلْيُكْرِمْ ضَيْفَهُ جَائِزَتَهُ
Man kāna yuʾminu bi-Llāhi wa-l-yawmi-l-ākhiri fa-l-yukrim jārah, wa man kāna yuʾminu bi-Llāhi wa-l-yawmi-l-ākhiri fa-l-yukrim ḍayfahu jāʾizatah
“Whoever believes in Allah and the Last Day, let him treat his neighbour well. And whoever believes in Allah and the Last Day, let him honour his guest with his due.”
Where this comes from
Abu Shurayh asked what the due was. A day and a night, and hospitality is three days, and past that it is charity to him. And the third clause: whoever believes in Allah and the Last Day, let him say something good or stay silent.
The full narration
Narrated Abu Shuraih Al-Adawi:My ears heard and my eyes saw the Prophet (ﷺ) when he spoke, "Anybody who believes in Allah and the Last Day, should serve his neighbor generously, and anybody who believes in Allah and the Last Day should serve his guest generously by giving him his reward." It was asked. "What is his reward, O Allah's Messenger (ﷺ)?" He said, "(To be entertained generously) for a day and a night with high quality of food and the guest has the right to be entertained for three days (with ordinary food) and if he stays longer, what he will be provided with will be regarded as Sadaqa (a charitable gift). And anybody who believes in Allah and the Last Day should talk what is good or keep quiet (i.e. abstain from all kinds of dirty and evil talks)
Source
Ṣaḥīḥ al-Bukhārī · 6019
- Agreed upon as authentic (al-Bukhārī / Muslim)