Psalms 105:36 Kabbalah

וַיַּ֣ךְ כָּל־בְּכ֣וֹר בְּאַרְצָ֑ם רֵ֝אשִׁ֗ית לְכָל־אוֹנָֽם׃

He smote also all the first-born in their land, The first-fruits of all their strength.

Read kabbalistic (mystical) interpretation of Psalms 105:36: and classical mystical sources.