"On building a temple of Sri Krishna one can attain the eternal Vaikuntha-loka.  One who offers the Lord a garden laden with fruits and flowers will attain heavenly pleasures."

–Vamana Purana

"A person who builds a temple of Sri Vishnu will get the same results as performing the Rajasuya Yajna and Ashvamedha Yajna.  Oh best of the brahmanas, as many atoms are there in the temple so built, for so many thousands of years will he be able to reside in the heavenly planets."

–Vishnu Dharmottara Purana