ENOfficial
'Abdullah said, "When one of you seeks something he needs, he should ask for something small. He will have what is decreed for him. None of you should go to his companion and then praise him and thus break his back."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ قَالَ: حَدَّثَنِي الأَعْمَشُ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي الأَحْوَصِ، عَنْ عَبْدِ اللهِ قَالَ: إِذَا طَلَبَ أَحَدُكُمُ الْحَاجَةَ فَلْيَطْلُبْهَا طَلَبًا يَسِيرًا، فَإِنَّمَا لَهُ مَا قُدِّرَ لَهُ، وَلاَ يَأْتِي أَحَدُكُمْ صَاحِبَهُ فَيَمْدَحَهُ، فَيَقْطَعَ ظَهْرَهُ.
sunnah.com