Ekadasi Vrata according to Hari Bhakti Vilas Digdarshani Tika
SUKLYE VA YADI VA KRSNE TAD VRATAM VAISNAVAM MAHAT
(HARI BHAKTI VILASA 12/5 from MATSYA PURANA and BHAVISYA PURANA)
Anybody who fasts on both Ekadasis on both the light and dark fortnights of the month and eats on the next day (Dvadasi), Lord Sri Krsna becomes very pleased with him.
EKA DASYAM NA BHUNJITA VRATAM ETAD DHIH VAISNAVAM
(HARI BHAKTI VILASA 12/6 from AGNI PURANA)
Full eating is condemned on Ekadasi and fasting on that day is certainly very pleasing to Lord Krsna.