וַיֹּ֨אמֶר יְהוָ֜ה אֶל־יֵה֗וּא יַ֤עַן אֲשֶׁר־הֱטִיבֹ֙תָ֙ לַעֲשׂ֤וֹת הַיָּשָׁר֙ בְּעֵינַ֔י כְּכֹל֙ אֲשֶׁ֣ר בִּלְבָבִ֔י עָשִׂ֖יתָ לְבֵ֣ית אַחְאָ֑ב בְּנֵ֣י רְבִעִ֔ים יֵשְׁב֥וּ לְךָ֖ עַל־כִּסֵּ֥א יִשְׂרָאֵֽל׃
And the LORD said unto Jehu: ‘Because thou hast done well in executing that which is right in Mine eyes, and hast done unto the house of Ahab according to all that was in My heart, thy sons of the fourth generation shall sit on the throne of Israel.’
Duties of the Heart
5. His father did good and it is fitting to benefit him in the merit of his father, as said to Yehu ben Nimshi "four generations of your descendants will sit on the throne of Israel" (Melachim II 10:30), and "He who walks innocently is righteous; fortunate are his sons after him." (Mishlei 20:7), and "I was young, and have aged, and I have not seen a righteous man forsaken nor his descendants begging bread." (Tehilim 37:25).