Pay it forward is an expression for describing the act that when you are the beneficiary of a good deed, you repay it to others (forward) rather than back to the person who did you the good deed.
Ngeenge oho longelwa kEendombwedi, kala ho futu ovanailonga voye pefimbo, to va pe omuvalu woimaliwa oyo we va udanekela, noku va pa omauwa keshe oo a teelelwa paveta.