There was an aged king who wanted to hand over his rule. He called his people and said: "Whoever can do three things — fast every day, pray night prayer (qiyam), and not get angry while ruling — I will appoint as my successor."
All were silent. Three things are heavy. Suddenly a young man stood: "I can, O King." That young man was Dzulkifli. The king was unsure: "You are still young. Can you do it?" Dzulkifli nodded.
As king, Dzulkifli fulfilled his three promises. Fasted every day. Always prayed night prayer. Did not get angry when judging cases, though people came one after another with problems.
One day, someone deliberately came again and again, during Dzulkifli's rest time, just to make him angry. But Dzulkifli served him patiently.
Allah praised Dzulkifli in the Qur'an: "And remember Isma'il, Ilyasa', and Dzulkifli. All were among the most excellent." (Sad: 48)
The name "Dzulkifli" itself means "the one with a portion" — one who can bear a great burden.
For children: don't promise what you can't keep. But once you promise, keep it — even if heavy.