Luqman - 31:19 Avoid ostentation in your walk and lower your voice. The ugliest sound is that of donkeys.
The believers walk without ostentation:
Luqman/31:19 Avoid ostentation in your walk and lower your voice. The ugliest sound is that of donkeys.

The Night Journey/17:37 Do not walk arrogantly on the earth; you cannot pierce the earth, nor can you be as tall as the mountains.

The Criterion/25:63 The servants of the Most Merciful are such that they walk in the earth without ostentation. And when the ignorant insult them, they offer peace.