Hadith #1972 (Jami' al-Tirmidhi)
Book: Chapters on Righteousness And Maintaining Good Relations With Relatives
Narrator(s): Anas ibn Malik, Muhammad bin 'Abdul 'Aziz al-Jarmi محمد بن عبد العزيز الجرمي, Muhammad bin 'Ubaid al-Tanafasi محمد بن عبيد بن أبي أمية الطنافسي

“Every good is charity. Indeed among the good is to meet your brother with a smiling face, and to pour what is left in your bucket into the vessel of your brother.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-1972/