Shir haMaalot on Friday afternoon

Hi,

On festive occasions, it is tradition to precede the birkat hamazon blessing after meals with Chapter 126 of Tehillim (Psalms), Shir haMaalot.

Because Friday afternoon is considered festive, as seen in the omission of tachanun at that time, one should recite Shir haMaalot before birkat hamazon at that time. The same applies for a meal on Saturday night.

(Rivivot Ephraim 1:140:1)

המצפה לישועה,
Mordechai