Rumi's Masnavi - (The meaning of) ‘the Devil became a true believer’ is made manifest on the occasion when by His (God's) grace a Yazíd becomes a Báyazíd.

(The meaning of) ‘the Devil became a true believer’ is made manifest on the occasion when by His (God's) grace a Yazíd becomes a Báyazíd.

اسلم الشیطان آنجا شد پدید ** که یزیدی شد ز فضلش بایزید

This topic is endless. Beware, O company (of travellers), keep your faces (safe) from that fortress! 3650

این سخن پایان ندارد ای گروه ** هین نگه دارید زان قلعه وجوه

Oh, let not vain desire waylay you, or ye will fall into everlasting misery.

هین مبادا که هوستان ره زند ** که فتید اندر شقاوت تا ابد

’Tis a bounden duty to abstain from peril: hear disinterested advice from me.

از خطر پرهیز آمد مفترض ** بشنوید از من حدیث بی‌غرض

In seeking relief (from sorrow) ’tis better that one's wits should be sharp: ’tis better to abstain from (falling into) the ambuscade of tribulation.”

در فرج جویی خرد سر تیز به ** از کمین‌گاه بلا پرهیز به

If their father had not spoken these words and had not warned them against that fortress,

گر نمی‌گفت این سخن را آن پدر ** ور نمی‌فرمود زان قلعه حذر

Their party would never have approached the fortress, their desire would never have inclined towards it; 3655

خود بدان قلعه نمی‌شد خیلشان ** خود نمی‌افتاد آن سو میلشان

For it was not well-known: it was exceedingly remote and aloof from the (other) fortresses and the highways.

کان نبد معروف بس مهجور بود ** از قلاع و از مناهج دور بود

(But) when he (the King) uttered that prohibition, their hearts were thrown by his speech into vain desire and into the quarter of phantasy,

چون بکرد آن منع دلشان زان مقال ** در هوس افتاد و در کوی خیال

And, because of this prohibition, a craving arose in their hearts to investigate the secret of that (fortress).

رغبتی زین منع در دلشان برست ** که بباید سر آن را باز جست