The Book of Marriage
Ṣaḥīḥ Muslim 3454
لاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلاَ يَخْطُبْ بَعْضُكُمْ عَلَى خِطْبَةِ بَعْضٍ
lā yabiʿ baʿḍukum ʿalā bayʿi baʿḍin walā yakhṭub baʿḍukum ʿalā khiṭbah baʿḍin
Transliteration generated from the Arabic vowel marks
The full narration
Ibn Umar (Allah be pleased with them) reported Allah's Apostle (ﷺ) as having said this:None amongst you should outbid another in a transaction, nor should he make proposals of marriage upon the proposal made by someone else
Source
Ṣaḥīḥ Muslim · 3454
Ṣaḥīḥ