תּלמוד אויף שמות 31:6

Rebbi Samuel bar Naḥmani in the name of Rebbi Yoḥanan: Corresponding to the eighteen times “commandment” is mentioned in the second description of the tabernacle¹⁵⁰The description of the actual construction of the tabernacle.. Rebbi Ḥiyya bar Abba said, only from (Ex. 38:23) “And with him Aholiab ben Aḥisamakh” to the end of the book¹⁵¹Since from the start of the section, v. 21, there would be 19 times mentioned that “the Eternal commanded Moses”..

R. Johanan said : The Holy One, blessed be He, only gives wisdom to him who has wisdom ; as it is said, "He giveth wisdom unto the wise, and knowledge to them that know understanding" (Dan. 2:21 ). Rab Tahlifa the Palestinian heard this and repeated it in the presence of R. Abbahu. He said to him : You learn it from there ; but I learn it from the following, for it is written, "In the hearts of all that are wise-hearted I have put wisdom" (Exod. 31:6).