until Jehovah have given your brethren rest, as [he hath given] you, and they also have possessed the land which Jehovah your God giveth them: then ye shall return unto the land of your possession, and possess it, which Moses the servant of Jehovah gave you beyond the Jordan toward the sunrising.
Joshua 1:13 Remember the word which Moses the servant of Jehovah commanded you, saying, Jehovah your God giveth you rest, and will give you this land.
Joshua 1:14 Your wives, your little ones, and your cattle, shall abide in the land which Moses gave you beyond the Jordan; but ye shall pass over before your brethren armed, all the mighty men of valor, and shall help them;
Joshua 1:15 until Jehovah have given your brethren rest, as [he hath given] you, and they also have possessed the land which Jehovah your God giveth them: then ye shall return unto the land of your possession, and possess it, which Moses the servant of Jehovah gave you beyond the Jordan toward the sunrising.
Joshua 1:16 And they answered Joshua, saying, All that thou hast commanded us we will do, and whithersoever thou sendest us we will go.
Joshua 1:17 According as we hearkened unto Moses in all things, so will we hearken unto thee: only Jehovah thy God be with thee, as he was with Moses.
The verse centers on "until", "jehovah", "given", "brethren", "rest", "hath", and "possessed". It is saying that the verse draws attention to "until" and "jehovah", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 14's "Your wives your little ones and your..." into verse 16's "And they answered Joshua saying All that...", so "until" and "jehovah" belong inside that flow. In Joshua context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "until" and "jehovah" with trust shaped by these words, not by a vague optimism outside the passage.