Commentary for I Chronicles 28:20

וַיֹּ֨אמֶר דָּוִ֜יד לִשְׁלֹמֹ֣ה בְנ֗וֹ חֲזַ֤ק וֶאֱמַץ֙ וַעֲשֵׂ֔ה אַל־תִּירָ֖א וְאַל־תֵּחָ֑ת כִּי֩ יְהוָ֨ה אֱלֹהִ֤ים אֱלֹהַי֙ עִמָּ֔ךְ לֹ֤א יַרְפְּךָ֙ וְלֹ֣א יַֽעַזְבֶ֔ךָּ עַד־לִכְל֕וֹת כָּל־מְלֶ֖אכֶת עֲבוֹדַ֥ת בֵּית־יְהוָֽה׃

And David said to Solomon his son: ‘Be strong and of good courage, and do it; fear not, nor be dismayed; for the LORD God, even my God, is with thee; He will not fail thee, nor forsake thee, until all the work for the service of the house of the LORD be finished.

Rashi on I Chronicles