1) Ch. 18, v. 1: "Va'yishma Yisro" And Yisro heard Rashi comments that he heard of the splitting of Yam Suf and the war with Amo'leik. He obviously heard much more, but these two events prompted him to come (verse 5). Why specifically these two events?
2) Ch. 18, v. 7: "Va'yeitzei Moshe likras chose'no" And Moshe went out towards his father-in-law How could Moshe, the leader of a nation, lower his esteem and go out to greet Yisro?
3) Ch. 18, v. 7: "Va'yishtachu lo" And he bowed down to him Is bowing down to a person have any tinge of sin connected to it, perhaps as a service of deifying the person?
4) Ch. 18, v. 16: "Ki yi'h'yeh lo'hem dovor ba eilai" When THEY will have a matter HE comes to me This phrase begins in the plural form and changes to singular.
5) Ch. 20, v. 9: "Taavode v'osiso kol m'lachtecho" You shall labour and do all your work What is the difference between "avodoh" and "mlochoh?"
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