What is the ruling for a pilgrim who has performed tahallul and then remembers that the tawaf was fewer than seven rounds?

Summary

A tawaf of fewer than seven rounds is not valid, so the pilgrim must complete the tawaf, then perform the sa’ie and shave or trim the hair. A dam is also required because the hair was cut before the tawaf and sa’ie were complete. This is a dam of choice with a fixed measure: slaughtering one goat in the Haram land, giving two cupak of food each to six poor people in the Haram land, or fasting for three days.

Written in our own words from the original fatwa — check the source before acting on it.