Skandapurana 5.45.12

5.45.12

vṛkṣamūlaṃ samāśritya niviṣṭaśca kṣitau tataḥ..
tuṣṭāvātha śucirbhūtvā śraddhayā ca tripuṣkaram ......
madhyamādyojanaṃ svargaḥ kaniṣṭhādardha yojanam ..
jyeṣṭhakuṇḍātpunaḥ khyāto hastaprāyaḥ śubhātmabhiḥ .. 12 ..

Having resorted to the root of a tree, he sat down upon the ground; / then, having become pure, he praised the three Puṣkaras with faith: / “Heaven is a yojana from the Middle one, half a yojana from the Smallest, / while from the Eldest pool it is declared by the pure-minded to be nearly a cubit away. 12