Shiva Purana
तपः कर्म जपो ध्यानं ज्ञानं वेत्यनुपूर्वशः ॥ पञ्चधा कथ्यते सद्भिस्तदेव भजनं पुनः ॥ ४८॥
The same adorative service is further explained as fivefold, viz, penance, holy rites, Japa, meditation and knowledge.
english translation
tapaH karma japo dhyAnaM jJAnaM vetyanupUrvazaH ॥ paJcadhA kathyate sadbhistadeva bhajanaM punaH ॥ 48॥
hk transliteration by Sanscript