It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every good deed is charity, and it is also a good deed that you meet your brother with a cheerful face or pour some water from your bucket into his vessel.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14877
Hadith Gradingحکم دارالسلام:صحيح بطرقه وشواهده، خ- الشطر الأول-: 6021، وهذا إسناد ضعيف لضعف المنكدر بن محمد بن المنكدر