Great article from One for Israel, an evangelical outreach ministry by native Israeli believers in Jesus on God’s eternal covenant with Israel.
http://oneforisrael.org/blog/308-is-jewish-possession-of-israel-conditional-on-their-good-behavior
Apr
19
2016
Brit In Jerusalem 
Interesting article….
Section 8 of this article is worth reading too on this theme, as are the comments underneath:
http://www.prophecytoday.uk/study/teaching-articles/item/313-israel-q-a.html