Shiva Purana
यथाशक्त्यानुरूपेण कर्तव्यं सर्वदा नरैः । सप्तस्वपि च वारेषु नरैः शुभफलेप्सुभिः ४२ ।
The worship shall be carried out by men seeking good benefits in all the seven days in accordance with their capacity.
english translation
yathAzaktyAnurUpeNa kartavyaM sarvadA naraiH । saptasvapi ca vAreSu naraiH zubhaphalepsubhiH 42 ।
hk transliteration by Sanscript