As regards the Tabernacle of Nob, I propose that "destruction" refers to the cruel, unjust execution of the priests and inhabitants of Nob by
Doeg the Edomite at King Saul's behest, after which the Tabernacle was forcibly uprooted and transplanted to Gibeon.
Its seriousness is exemplified in the classic example of gossip in the statement by
Doeg the Edomite that Nov, the city of priests, gave David food and arms, as told, not in Numbers, but in I Samuel (Chaps.
In Yevamot 76b the Talmud tells a strange story:
Doeg the Edomite then said to [Abner], 'Instead of enquiring whether [David] is fit to be king or not, enquire rather whether he is permitted to enter the assembly or not!' 'What is the reason?' 'Because he is descended from Ruth the Moabitess.' Said Abner to him, 'We learned: an Ammonite, but not an Ammonitess; A Moabite, but not a Moabitess!'