וְהִפְלָ֣ה יְהוָ֔ה בֵּ֚ין מִקְנֵ֣ה יִשְׂרָאֵ֔ל וּבֵ֖ין מִקְנֵ֣ה מִצְרָ֑יִם וְלֹ֥א יָמ֛וּת מִכָּל־לִבְנֵ֥י יִשְׂרָאֵ֖ל דָּבָֽר׃
And the LORD shall make a division between the cattle of Israel and the cattle of Egypt; and there shall nothing die of all that belongeth to the children of Israel.’
Read kabbalistic (mystical) interpretation of Exodus 9:4: and classical mystical sources.