If what has been built survives, the builder will receive a reward.
OJBIf anyoneʼs ma'aseh he built on the yesod will survive, a sachar (reward) he will receive;
TCENTIf the work that anyone has built remains, he will receive a reward.
T4TWhen a fire starts burning a house, it becomes clear whether the builders used materials in their work that will burn, or materials that will not burn. Similarly [MET], when God judges us, it will be clear whether we taught others things that were long-lasting and valuable or not. If the materials that are used to build a house are materials that do not burn, the builder will receive a reward [MET]. Similarly, if we have taught others things that are valuable and long-lasting, God will give us a reward.