the appearance of the phrase 'cross my heart (and hope to die)

origin: USA – 2nd half of the 19th century – from the action of making a small sign of the cross over one’s heart, which sometimes accompanies the words

What is the full poem from which the phrase, 'Cross my heart and hope to die, stick a needle in my eye' originates? - Quora

Cross My Heart and Hope to Die

cross my heart and hope to die, welcome to my darkside” 💀

Sign of the cross - Wikipedia

What does the phrase 'cross my heart' mean? Where did it come from

What does the phrase 'cross my heart' mean? Where did it come from? - Quora

Nora Dåsnes: Cross My Heart and Hope to Die - material download here - Oslo Literary Agency

What does the phrase 'cross my heart' mean? Where did it come from? - Quora

What does it mean when someone says 'cross my heart and hope to die'? - Quora

What is the meaning of Cross my heart and hope to die? - Question about English (UK)