And if thou wilt walk in my ways
Prescribed and directed to in his word, to keep my statutes and my commandments;
ceremonial, moral, and judicial: as thy father David did walk;
which Solomon himself had observed, ( 1 Kings 3:6 ) ; and whose walk was worthy of his imitation: then I will lengthen thy days;
the other promises of riches and honour are absolute, but this of long life conditional, depending upon his holy walk and conversation; and hence, because he failed in this the Jews observe he did not attain to long life, dying, as they suppose, at fifty two years of age; which is grounded on a wrong hypothesis, that he was but twelve years of age when he he began to reign, and he reigned forty years, as before observed.
The Brenton translation of the Septuagint is in the public domain.