Rashi, on Ps 32:15

“He who hath made the hearts of every one of them: who understandeth all their works.”

“He Who forms their hearts together All of their hearts together and knows all the thoughts. Our Sages, however, explain that it refers back to “From His dwelling place, the Creator oversees their hearts together,” and they derived from here that all are examined with a single glance (Rosh Hashana 18a).”

Imported from an open dataset — not yet checked against the printed edition.