Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "Make goodness your habit, for goodness comes through habit, and guard your intentions with regard to the prayer."
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2578