Sayyiduna Ibn Mas'ud (may Allah be pleased with him) narrates that once I asked the Prophet (peace and blessings of Allah be upon him): "Which deed is most beloved to Allah?" The Prophet (peace and blessings of Allah be upon him) replied: "Prayer at its proper time, kindness to parents, and striving in the way of Allah." If I had asked further questions, the Prophet (peace and blessings of Allah be upon him) would have answered them as well.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 3973
Hadith Gradingحکم دارالسلام:إسناده صحيح، خ: 527، م: 85، أبو عبيدة - وإن لم يسمع من أبيه ابن مسعود - متابع.