יוֹסֵף yosep "Joseph" is used in three different but related expressions in Amos,

(i) at 5:6 "house of Joseph" (beth yoseph) echoes other expressions Amos uses more often "house of Israel" (5:1, 25; 6:1, 14; 7:10; 9:9); "house of Jacob" (3:13; 9:8) and "house of Isaac" (7:16)

(ii) at 5:15 "remains of Joseph". sherith yoseph sounds like beth yoseph, yet the meaning and especially the emotional flavor is very different

(iii) by 6:6 both sound (sheber yoseph) and meaning "ruin of Joseph" have changed again - and not for the better.