וְשֹׁמֵ֣עַֽ לִ֭י יִשְׁכָּן־בֶּ֑טַח וְ֝שַׁאֲנַ֗ן מִפַּ֥חַד רָעָֽה׃ (פ)
오직 나를 듣는 자는 안연히 살며 재앙의 두려움이 없이 평안하리라
Rashi
and shall be tranquil Heb. ושאנן and shall be tranquil and at rest. The word ושאנן is in the future tense; therefore, [the “nun”] is vowelized with a “pattah.”