Did God approve Jehu's lie in 2 Kings 10:18? - No.

Did God celebrate Yehu's abolishment of Baal worship in 2 Kings 10? - Yes.

• Yehu (יֵה֗וּא) was celebrated for abolishing The-Baal ( הַבַּ֖עַל ) idol from being worshipped, and for destroying the House of Baal (בֵּ֣ית הַבַּ֔עַל) .

2 Kings 10 [MT]

[28] "And Yehu abolished The-Baal from-Yisrael." (וַיַּשְׁמֵ֥ד יֵה֛וּא אֶת־הַבַּ֖עַל מִיִּשְׂרָאֵֽל )

[30] "And YHVH said to Yehu, "Since you did well by executing what was proper in My-Eyes; according to all that was in My-Heart you have done to the house of Ahab, your descendants of the fourth generation shall occupy the throne of Yisrael." (וַיֹּ֨אמֶר יְהֹוָ֜ה אֶל־יֵה֗וּא יַ֚עַן אֲשֶׁר־הֱטִיבֹ֙תָ֙ לַעֲשֹ֚וֹת הַיָּשָׁר֙ בְּעֵינַ֔י כְּכֹל֙ אֲשֶׁ֣ר בִּלְבָבִ֔י עָשִֹ֖יתָ לְבֵ֣ית אַחְאָ֑ב בְּנֵ֣י רְבִעִ֔ים יֵשְׁב֥וּ לְךָ֖ עַל־כִּסֵּ֥א יִשְׂרָאֵֽל)

Did God approve Jehu's lie in 2 Kings 10:18? - No.

• 2 Kings 10:19 explains the method for destroying the House of The-Baal was all Yehu's idea : "but-Yehu was acting with cunning, in order to exterminate worshippers of The-Baal" (וְיֵהוּא֙ עָשָֹ֣ה בְעָקְבָּ֔ה לְמַ֥עַן הַאֲבִ֖יד אֶת־עֹבְדֵ֥י הַבָּֽעַל)

Did God celebrate Yehu's abolishment of Baal worship in 2 Kings 10? - Yes.

• Yehu (יֵה֗וּא) was celebrated for abolishing The-Baal ( הַבַּ֖עַל ) idol from being worshipped, and for destroying the House of The-Baal (בֵּ֣ית הַבַּ֔עַל) .

2 Kings 10 [MT]

[28] "And Yehu abolished The-Baal from-Yisrael." (וַיַּשְׁמֵ֥ד יֵה֛וּא אֶת־הַבַּ֖עַל מִיִּשְׂרָאֵֽל )

[30] "And YHVH said to Yehu, "Since you did well by executing what was proper in My-Eyes; according to all that was in My-Heart you have done to the house of Ahab, your descendants of the fourth generation shall occupy the throne of Yisrael." (וַיֹּ֨אמֶר יְהֹוָ֜ה אֶל־יֵה֗וּא יַ֚עַן אֲשֶׁר־הֱטִיבֹ֙תָ֙ לַעֲשֹ֚וֹת הַיָּשָׁר֙ בְּעֵינַ֔י כְּכֹל֙ אֲשֶׁ֣ר בִּלְבָבִ֔י עָשִֹ֖יתָ לְבֵ֣ית אַחְאָ֑ב בְּנֵ֣י רְבִעִ֔ים יֵשְׁב֥וּ לְךָ֖ עַל־כִּסֵּ֥א יִשְׂרָאֵֽל)