Surah Al-Nahl (The Bees), Verse 92

وَلَا تَكُوْنُوْا كَالَّتِیْ نَقَضَتْ غَزْلَهَا مِنْ بَعْدِ قُوَّةٍ اَنْكَاثًا تَتَّخِذُوْنَ اَیْمَانَكُمْ دَخَلًا بَیْنَكُمْ اَنْ تَكُوْنَ اُمَّةٌ هِیَ اَرْبٰی مِنْ اُمَّةٍ اِنَّمَا یَبْلُوْكُمُ اللّٰهُ بِهٖ وَلَیُبَیِّنَنَّ لَكُمْ یَوْمَ الْقِیٰمَةِ مَا كُنْتُمْ فِیْهِ تَخْتَلِفُوْنَ ۟

Wa laa takoonoo kallatee naqadat ghazlahaa mim ba'di quwwatin ankaasaa; tattakhizoona aimaanakum dakhalam bainakum an takoona ummatun hiya arbaa min ummah; innnamaa yablookumul laahu bih; wa la yubaiyinanna lakum yawmal Qiyaamati maa kuntum feehi takhtalifoon

“And be not like a woman who breaks into untwisted strands the yarn which she has spun, after it has become strong. Nor take your oaths to practise deception between yourselves, lest one party should be more numerous than another: for Allah will test you by this; and on the Day of Judgment He will certainly make clear to you (the truth of) that wherein ye disagree.”

Quran 16:92 (Yusuf Ali Translation)