Why did the news about God’s blessing on the household of Obed-edom prompt David to go and bring the ark to Jerusalem?
When David heard about the blessing which had come upon Obed-edom, he realized that the same blessing could also come to Jerusalem if the ark was to be housed in the city.1 The Lord was not necessarily against his plans to move the ark but he had to make sure to move it in an appropriate manner.
12 On vint dire au roi David: L'Eternel a béni la maison d'Obed-Edom et tout ce qui est à lui, à cause de l'arche de Dieu. Et David se mit en route, et il fit monter l'arche de Dieu depuis la maison d'Obed-Edom jusqu'à la cité de David, au milieu des réjouissances.