وَلَكَ
Walaka
And you.
Ahmad 5/82, and An-Nasa'i in 'Amalul-Yawm wal-Laylah p. 218, with checking by Dr. Farooq Hamadah.
الدُّعَاءُ لِمَنْ قَالَ غَفَرَ اللَّهُ لَكَ
Returning a supplication of forgiveness
Vinavyohusiana
When wearing a garmentWhen wearing a new garmentTo someone wearing a new garmentBefore undressingBefore entering the bathroomAfter leaving the bathroomRemembrance when leaving the homeRemembrance upon entering the homeWhen breaking fast in someone’s homeFor travelUpon entering a town or villageWhen entering the marketSupplication of the traveller for the residentSupplication of the resident for the travellerStopping or lodging somewhere in travel and otherwiseWhile returning from travelReturning a greeting to a disbeliever