Vishnupurana 2.9.10

2.9.10

na bhraśyanti yatas tebhyo jalāny abhrāṇi tāny ataḥ
abhrasthāḥ prapatanty āpo vāyunā samudīritāḥ
saṃskāraṃ kālajanitaṃ maitreyāsādya nirmalāḥ //

During eight months of the year the sun attracts the waters, which are the essence of all fluids, and then pours them upon earths (during the other four months) as rain: from rain grows corn; and by corn the whole world subsists. The sun with his scorching rays absorbs the moisture of the earth, and with them nourishes the moon. The moon communicates, through tubes of air, its dews to the clouds, which, being composed of smoke, fire, and wind (or vapour), can retain the waters with which they are charged: they are therefore called Abhras, because their contents are not dispersed. When however they are broken to pieces by the wind, then watery stores descend, bland, and freed front every impurity by the sweetening process of time. The sun, Maitreya, exhales watery fluids from four sources, seas, rivers, the earth, and living creatures. The water that the sun has drawn up from the Gangá of the skies he quickly pours down with his rays, and without a cloud; and men who are touched by this pure rain are cleansed from the soil of sin, and never see hell: this is termed celestial ablution. That rain which falls whilst the sun is shining, and without a cloud in the sky, is the water of the heavenly Ganges, shed by the solar rays. If, however, rain falls from a bright and cloudless sky whilst the sun is in the mansion of Krittiká and the other asterisms counted by odd numbers, as the third, fifth, &c., the water, although that of the Gangá of the sky, is scattered, by the elephants of the quarters, not by the rays of the sun: it is only when such rain falls, and the sun is in the even asterisms, that it is distributed by his beams.