Śatapatha Brāhmaṇa ("of a hundred paths") 7.5.2.62

7.5.2.62

tā etā aṅgulayaḥ | tāḥ | sarvata upadadhāti sarvato hīmā aṅgulayo 'nteṣūpadadhātyanteṣu hīmā aṅgulayaścaturdhopadadhāti caturdhā hīmā aṅgulayaḥ pañca-pañcopadadhāti pañca-pañca hīmā aṅgulayo nānopadadhāti nānā hīmā aṅgulayaḥ sakṛtsakṛtsādayati samānaṃ tatkaroti tasmātsamānasambandhanāḥ

These (bricks) are fingers (and toes): he puts them on all sides, for these fingers (and toes) are on all sides; he puts them at the ends, for these fingers (and toes) are at the ends; in four sets he puts them on, for these fingers (and toes) are in four sets; five he puts on each time, for there are five fingers (or toes) at each (limb); separately he puts them on, for separate are these fingers (and toes); only once he 'settles' each (set): he thereby makes (each set) one and the same, whence they have a common connecting-link.