This statement is a well-established foundational definition of hydrogen bonding in chemistry and represents common knowledge, requiring no citation.
The claim states that hydrogen bonding occurs when hydrogen is covalently bonded to highly electronegative atoms (such as N, O, or F). This is a standard definition found in introductory chemistry and standard scientific nomenclature, making it common knowledge. Although several retrieved papers discuss hydrogen bonding characteristics, definitions, or donor-acceptor properties (e.g., papers 4 and 7), truisms and definitional statements do not require empirical citations or receipts.