Garudapurana 1.48.16

1.48.16

uttare raktavarṇā tu śukleśī ca patākikā /
bahurūpā tathā madhye indravidyeti pūrvake //

in the north, red-colored; and at the northeast, white; / and in the middle, multicolored. [With the mantra] "indram agnim" in the east;